Motorcycle Battery Not Charging While Running

This type of charge does not force current through the battery. First, you need a battery that is fresh and holds a charge. Whether or not running the generator will keep the battery charged depends on: How often you run the generator. Motorcycle Troubleshooting Guide. I've been troubleshooting my 1975 Suzuki TS185 charging system for a while now and am a bit of a dead end. Battery Life of. Generally, your best bet is to use the charger/generator in the AM, and bulk the batteries early, and let the sun do the slower part of the charging. Check your local car stereo place, they may be able to get a code for your stereo. Battery Tender Not Charging Motorcycle Battery Reviews 2019  What is Battery Reconditioning. Voltage regulated chargers such as the Banner Accucharger are best suited. You won't even have to open your hood to charge your battery. For those trickle charger units that are just a transformer you plug into the wall and connect two leads to the battery, probably not a good idea. No, it is not the all common cold start issue that we are. Hi Kasha – the battery probably died. Since the bike is running and the headlights are on, and the injectors are going and the ECU is doing its thing, All this is taking away from your X. The answer seems simple but there are a few things to consider. If its a real big rolling boil, like a put on the stove then thats bad, but a little hiss and bubbles is normal. hi, so i have a Verettuc or something like that , it is a chinese scooter. Internal battery cell shorts gradually reduced the no load voltage and seriously reduce the ability of the battery to produce the required cranking current. Stator - stationary with brushes. The discharged battery does not produce as much voltage as the fully charged battery. DO NOT TRY CHARGING A GAMEBOY ADVANCE SP's BATTERY FROM YOUR PCs USB PORT. Occaisional stator testing is pretty quick and easy and knowing how to do this realy helps as sometimes it isnt the stator at fault, but a bad battery or connectors and wiring While I'm rantin on there are stators and stators. Deep Cycle Battery San Diego Offers Free Local Delivery in San Diego and Offers Battery Installation. The proper way is to check it with a volt meter at the battery with the vehicle running. At idle, your bike will not produce enough voltage to recharge a battery, so even running the bike for a long time will not charge it reliably. Saying the first thing, the alternator gets to be replaced, or. Although split charge systems are designed to keep the starter and leisure batteries separated when the engine is not running, there might be emergency circumstances where you want to intentionally join them , for example if the starter battery fails and you need to start the engine from the leisure battery or if your leisure battery fails and. So any battery will take a while to fully charge. This type of charge does not force current through the battery. you'll get 2 hours at the most. If the battery is getting cooked it will be quite warm and you will likely smell it. You can idle your car and allow it to fully charge the battery or drive around your neighborhood for about 20 minutes to fully charge the battery. Fun fact, acording to that skill set, a dolphin can change your car battery. the cold weather at this time of year doesn't help the situation either. Cold batteries discharge faster than warmer batteries, so if you're using a cold battery, keep a warm one in reserve. More often than not, everything is fine. You'll likely see a small dip in voltage running across the battery when the motorcycle is on it not running. I would have the charging system checked, and a new battery put in. When the engine is running, measure the battery's voltage again. Note: the 2A current limit & decrease must be there, because otherwise the battery would start boiling. com Jeff Slavens gives a quick overview about how to check your motorcycle charging system. Steps for calculating trolling motor battery run time:. IS IT BETTER FOR DEWALT® BATTERIES TO BE COMPLETELY DISCHARGED BEFORE CHARGING? No. Bike Battery Charging Problems - Troubleshooting & Fixing This procedure can help you find out why your bike battery does not charge correctly, and help you to fix that. So, in terms of charging cycles, how long do Lithium-ion batteries last?. Battery is recharged while scooter is running. (This is why wires get hooked up in a specific order when jump-starting. So, both methods require supervision. no problem. The CTEK MXS 5. The only difference between a trickle charger and a BIG ASS CHARGER is it's charge voltage while under load. Internal battery cell shorts gradually reduced the no load voltage and seriously reduce the ability of the battery to produce the required cranking current. There are some fundamentals to how the charging system works. She started right up this morning, so everything is pointing to the cheap phone charger I had plugged in. Re: Does an outboard engine recharge the battery when running like a car does? Almost all electric start outboards have an alternator to recharge the battery. The reasoning being that if the alternator was switched off in flight the battery would go flat with normal load and the laternator could not be brought back charging because there would not be enough battery power to re excite the alternator. 5v at X amount of amps. The Slow Crank. Your charging system is responsible for restoring the charge to your car battery after use and is tasked with providing power to your lights, audio system, and other electronics while your vehicle is running. The it goes to blinking green which means it IS topped off. Some people will tell you that you have to fit a 12V armature & field coil, but if your dynamo is charging OK on 6V it will also charge OK on 12V without any mods. This means you should be able to charge it all day if you are riding the motorcycle. This could be one of several things. No, it is not the all common cold start issue that we are. If you were suspecting a battery problem because you had difficulty starting the engine, or you had problems with another electrical circuit, or the alternator warning light on the dashboard is coming on (charging system problems), your problem is not with the battery. A fully charged battery should read 12. Found my battery not charging. The beauty of the setup is that it uses pedal power to charge the battery, not to power the devices, so the lights don't go out. Again, thanks for sharing. to get to a point where the battery won't take a charge. The fan does run for a while after the engine is shut off. A: The short answer is, No. The answer seems simple but there are a few things to consider. Running a sprayer and the cooling fan cannot be easy on a battery with the limited charging capacity of a stator system. This means the battery is the sole supplier of electrical power and soon goes flat. 2 volts with the key off. Then check the alternator belt for proper tension. Put it in this year, didn't start. Spare yourself the stress with a good battery charger, which can protect your vehicle's power supply from running dry and keep you from getting left the lurch. Best Practices for Battery Life. Lithium Polymer Charging/Discharging & Safety Information. It may be necessary to charge the battery overnight if the battery is completely depleted. Simply put, stronger batteries that hold more Amp Hours / Charge, need to be physically larger to do so. Motorcycle Battery Not Charging While Running: Batteries lose charge over time and replacing them can be expensive. 6, your battery has a good charge. While this is one option to retrieve. The battery might be leaking from over-using or over charging. This NEEDS to be correctly charged and tested before you start and troubleshooting. com FREE DELIVERY possible on eligible purchases. Cold batteries discharge faster than warmer batteries, so if you're using a cold battery, keep a warm one in reserve. "I'm a professional. On the road or at home, the HALO Bolt's two USB outputs allow you to charge multiple devices at once, so you can power up your smartphone while your kids stay busy with their charged tablets. Battery will not charge. If the charging system (or an external charger) wins, the load is met and slightly exceeded, so that the battery is being slightly charged. Check bike vitals like battery charge status, see its location on a map, and get security alerts if it’s been bumped, tampered with or moved. Some motorcycles take on much power from the battery with little spare power available for extra accessories. While it is necessary to have one car running when trying to jump-start another car, motorbike batteries don’t require the same amount of energy, so the car should be left off for the duration of this process. who look to keep their vehicles running even if they’re not quite sure exactly how to go about that. If these steps do not work after three or four more tries, stop trying to jump-start. I would avoid buying an inexpensive battery from Wally World,etc unless you are only going to ride this bike for short term and then park it. Try removing the battery and charging it fully. I put in basement after 2nd year. You can remove the battery from your bike altogether and trickle charge it all winter. 1977 240D when car is running i am getting 11. Because of this a battery charger can be left connected. It has to be charged using an external 12V battery charger. When charging a “low” battery, the discharged battery will accept a large amount of current flow, if power is delivered at the full 14. Though not distilled. You cannot record while charging with a computer. So I put on my real battery charger and left it on overnight. Charging System Warning Lights The importance of having an operational warning light for the alternator (idiot light) is crucial to catching problems early. Find batteries, battery chargers and power supplies for your device. If the charging system (or an external charger) wins, the load is met and slightly exceeded, so that the battery is being slightly charged. This is done with six solid-state "diodes," mounted in the alternator housing. While it is necessary to have one car running when trying to jump-start another car, motorbike batteries don't require the same amount of energy, so the car should be left off for the duration of this process. Battery Charging. It’s better to not fully charge or fully drain your battery. I guess I still wouldn't do it if the battery was significantly low because the stator still is not designed to charge a very low battery. 7 V, and the specifications of CCCV charging of an AGM battery say that an AGM battery is at least 80% full when the voltage reaches 14. If it’s at least four years old, then it should probably be replaced. Automatically switches to 6 or 12 volt, depending on your battery voltage. As the Battery ages it will begin to lose capacity or run time. We accomplish this by having customer service. The rest ends up as heat. If you are running the motorcycle on the ride you will be charging your battery so there should be no significant loss. ) Possible Cause: Ride On Toy accelerator switch not operating properly. 6 volts to 12. Simply put, stronger batteries that hold more Amp Hours / Charge, need to be physically larger to do so. Hot to the point where it can be smelled when I walk into the garage. Cold batteries discharge faster than warmer batteries, so if you're using a cold battery, keep a warm one in reserve. Running an inverter is not efficient as you end up losing power just to run the inverter. Where an Alternator is made to charge up a battery and keep it charged. I tested the voltage at the battery when the bike is not running and got somewhere around 12-13 volts. Use of an attachment not recommended or sold by OPTIMA® may result in a risk of. Most systems do not charge the battery at idle for the output voltage is too low. When the lights are on the battery seems to lose charge even when the engine is running. The V-Star 1100 Charging System There is a lot of issues noted online about the V*1100 charging system. I went to start my motorcycle after a long winter and it, expectantly, did not start due to not enough charge in the battery. My motorcycle is not charging the battery. If you're reading this article, your bike ain't starting, and you can't take a ride for at least a few hours and that makes me sad for you. If the battery was "forgotten" in the motorcycle, please charge the motorcycle battery. Do not use the battery charger unless the batte ry voltage matches the output voltage rating of the charger. Once you're charged up, just connect the EverStart Power Sport Battery to your favorite motorcycle, ATV, riding lawnmower, snowmobile, or other motorized vehicle, and you are ready to ride. Because of the high power demands of the camper's devices, these batteries drain quickly. If the battery falls below the required point while the battery maintainer is still hooked up, then it will start to charge again. Power Tools - Best Practices for Long Battery Pack Life 1. 25A Deltran Battery Tender Plus to use for my Honda CB550. , with 5A charging current, a 12V/62Ah lead acid battery starts boiling almost immediatelly. While this is one option to retrieve. The battery voltage started at 12. Series And Parallel Charging For non-urgent support, please Request A Callback. You can estimate how long the battery will run the motor on a single charge. A trickle charger may be used but must not be run for more than a half-hour each day. You could run a large 8-gauge wire from the battery allthe way up to a switch under the dash and back to the fan. It wont/cant charge the battery. After the electric stator is used it may take some time for the battery to reach normal operating voltage. The fan does run for a while after the engine is shut off. Any one of these symptoms can be a sign of a weak charging system. Put the battery on the battery charger till it has a full charge. So, both methods require supervision. Running a battery in this condition will shorten the life also. Essentially I would like to charge this GPS device from a Motorcycle battery such as this, without it draining flat between rides, or draining the bike battery. While it is necessary to have one car running when trying to jump-start another car, motorbike batteries don't require the same amount of energy, so the car should be left off for the duration of this process. You may want to get one somehow, put it on the battery and measure the voltage when the bike is not running and also with the bike running. Make sure the positive lead does not touch metal on the bike. People often think that a dead battery should be discarded and pay huge bucks to buy a brand new one. b:You discovered that something in your car was drawing power from the battery even while off, and you need to find out what it is. You will know this if you place a new battery in the car and it freezes also - not charging is a probable cause. Charge the battery in a well-ventilated area, particularly if your battery isn't "maintenance free. Voltage regulated chargers such as the Banner Accucharger are best suited. You should see 14. The rest ends up as heat. Then you may want to start a thread in the appropriate section of TT - DRZ, etc. As the Battery ages it will begin to lose capacity or run time. Stumped on this one. Learn how to give them new life with our step by step battery reconditioning guide. Table 1: Do's and don'ts summary of how to use, maintain and dispose of batteries. Battery: This is a huge part of your charging system. No change when revving the bike up. Motorcycle Battery Not Charging While Running: Batteries lose charge over time and replacing them can be expensive. 8V during the charge cycle it can be used to charge a Battery Tender ® Lithium Battery. It archives it and saves your info for you. The relay clicking should not 'block' charging, but with only a 2a charger, it may be consuming electricity as fast as the charger can supply. 0 Earbuds LED Display with Charging Bin Power Bank and Microphone, sale ends soon. Particularly on smaller motors whose alternators charge slowly. Your charging system is responsible for restoring the charge to your car battery after use and is tasked with providing power to your lights, audio system, and other electronics while your vehicle is running. Cold Cranking Amps (CCA) CCA is a rating used in the battery industry to define a battery's ability to start an engine in cold temperatures. Using a charging system with a regulator should be fine. How Long Does a Car Battery Last without Driving. A cheap trickle charger would continue charging indefinitely and ruin the battery. , that operate continuously after the engine is stopped and the ignition key has been switched off. Voltage only around 12 volts while running regardless of rpm. This should be the best place to start. Only at www. So lets just say at Idle you are producing 13. A replacement Ultrabatt Lithium battery weighs an amazing 860 grams complete with the built in Battery Management System. to leave your generator running for hours (which can be rather noisy and expensive to run). Buy Battery Chargers. 0 volts the overcharge rate of a fully charged battery is C/1000, and at 13. com FREE DELIVERY possible on eligible purchases. A good 6V dynamo WILL run a 12V system without any drama. You must find between 13. However, while in the low output mode, the alternator is not actually "charging" the battery but it is just holding the battery voltage at 12. The motorcycle parts and accessories selection is second to none, along with our sections for Dirt Bike, ATV, Snowmobile, and Scooters. motorcycle battery. If the light comes on while driving, stop the car, turn off the engine and check the alternator belt for proper tension. The accurate test of a storage battery is how many amps it will deliver for an hour "amp hours". It needs to run at higher RPMs to charge a battery, and I've always been told it's like that on a car too. Battery: This is a huge part of your charging system. I've been troubleshooting my 1975 Suzuki TS185 charging system for a while now and am a bit of a dead end. This NEEDS to be correctly charged and tested before you start and troubleshooting. You can estimate how long the battery will run the motor on a single charge. Again, thanks for sharing. My Battery was totally flat 0v. Battery Chargers. A traditional battery that's at 10. You don't say what happens with the lights. but while idling the volt meter on the dash will go as low as 8 volts. LED lights are a popular way of saving money in the home. Obviouslly though just bear in mind you are using up battery charge like fuel, so always make sure you are able to charge it, and try not to turn the engine off till you get home (else it might not restart)!. Rev the engine slightly. Voltage only around 12 volts while running regardless of rpm. A low or failing battery can cause crazy readings during your testing. Particularly on smaller motors whose alternators charge slowly. It seems like a lot of folks just leave these chargers connected to the battery (while still on the bike) when the bike is sitting to keep a full charge on it at all times. For this reason, any motor with a stator less than about 10 amps charging output may not keep your battery fully charged and the battery will require manual charging periodically. This occurs when a lead acid battery is deeply discharged, causing sulfur from the battery acid to. On a 6-volt unit, a single shorted cell would knock you down to ~4v, making it obvious your battery is toast. Charging System Warning Lights The importance of having an operational warning light for the alternator (idiot light) is crucial to catching problems early. Most of the electrical components will operate satisfactorily with a voltage between 12 and 15. In fact, try not to charge it to 100 percent. You can fix rechargeable batteries once they fail to. How to Prolong the Battery Life of Your Smartphone, Tablet, and Laptop percent of its capacity for 500 charge cycles, while the number is 1,000 for iPad and MacBook models. The proper way is to check it with a volt meter at the battery with the vehicle running. While this Motorcycle Troubleshooting Guide is not a complete guide of every possible cause for each problem listed, it will help assist mechanics in troubleshooting some of the most common difficulties they will face. The disadvantage is, it creates alternating current, not direct, and the output must be "rectified," changed to DC, before being used to charge the battery. So commanding. uk has a huge selection of battery chargers, including standard car battery chargers, heavy-duty and deep-cycle units, traditional plug-in chargers, and solar-powered trickle units. Explosive and hazardous gases are an inherent byproduct of battery charging, do think ahead. Fully charged, engine not running, starting batteries (all REDTOP® or BLUETOP® 34M) should measure about 12. No change when revving the bike up. Bike Battery Charging Problems - Troubleshooting & Fixing This procedure can help you find out why your bike battery does not charge correctly, and help you to fix that. I've been troubleshooting my 1975 Suzuki TS185 charging system for a while now and am a bit of a dead end. The bikes I've worked on needed the battery to be charged to give full spark to the ignition, otherwise alternator output goes to charging the battery not the ignition. As you can see, even a big motorcycle battery is maxed out by a 2 Amp charger. Unlike the way a battery charger normally operates, the motorbike will use part of the batteries power for starting and, on some bikes, running odd relays etc. battery on harley softail is not charging while engine is running? What should I do? - Harley Davidson FLSTC Heritage Softail Classic question. because theres no battery the regulator is fine. Great convenience for your needssuaoki's car jump starter features a big LCD display with the numeric output of battery and percentage of battery consumption, so it's much easy to read and prevents low battery power occurs. When charging, you need to raise the voltage higher while the cell is at rest to push electricity into it. The techs at the bike shop told me I should keep my bike tendered when I. If the light does not come on, then reattach the negative battery cable and. I have been having isues with the battery, So I had a old battery that didnt seem to keep a charge and even when the bike was running I could not seem to get the thing above 6v So now I have a new battery and it is in the bike around 12. This battery should be a deep cycle type and sized to meet your run time expectations with the engine off. If you've been plugged into commercial power, the main transformer may have been running everything while the battery charger was not working. The fact is that there are many 12-volt battery chargers on the market today. Either the battery has a bad cell (five charged cells and one dead one = ~10. 5 volts you are good to go. But then on occasion i crank up the bike and my check engine light comes on and the battery indicator shows it is not charging and will run off of the battery system. SHORT RUN TIME (LESS THAN 15 MINUTES PER CHARGE). Well, the charging system does more than just charge the battery, while its charging its also running the rest of the bike. 6, your battery has a good charge. To charge all of the the time you will need to pull the power for the charger from the output side of the transfer switch. Apart from that, it's battery & bulbs. The HALO Bolt 57720 also features a convenient LED floodlight. While it is charging you can look at the charging system of the lawnmower. 2C it is the attained SOC that really makes. A: The short answer is, No. but while idling the volt meter on the dash will go as low as 8 volts. The overall life of the Battery is maximized with proper care, (follow Mfg. In the navigation view, tap on the gps signal strength bars in the lower-right corner. Many new car batteries are of the sealed 'maintenance' free variety. Without any load, the voltage should be 12 volts or marginally higher. Do not store Battery in a discharged state, charge it once a month when not in use. Charging a motorcycle battery is not hard, but there are some things you can do to make sure you. Because of the high power demands of the camper's devices, these batteries drain quickly. "I'm a professional. The charge in the unit lasted for about 2 days, so on the 3rd day, took it into town and charged it up at the local library. that can make a electric car battery charge while the time of. A charge cycle refers to the full recharging of a battery in a single charging session or several partial charging sessions. 12v Dakota Lithium LiFePO4 10Ah battery and charger included. At idle, your bike will not produce enough voltage to recharge a battery, so even running the bike for a long time will not charge it reliably. If you are charging your battery. We’ve come across many cases that are due to the ignition system, a defective speed system, an overheated engine, a bad MAP sensor (that thingy that reads the air and fuel ratio). After I safely made a complete stop I was able to fire her back up no problem. I think the battery charging mode works well for bulk charging, but it won't maintain charging above about 90% SOC. With cellular telematics connectivity powered by Panasonic ®, you can connect remotely through your smart phone using the latest version of the Harley‑Davidson™ App. Can electric vehicles self-charge? millions by selling battery running motorcycle in the world. Most systems do not charge the battery at idle for the output voltage is too low. Hopefully, we can get you up and running quickly, though. Some bike's charging systems don't actually 'charge' the battery until a certain rpm limit is hit. T here is nothing more frustrating than your motorcycle refusing to start just when you thought you wanted to go for a relaxing ride. This and the 'dead battery' issues appear a lot. On a 6-volt unit, a single shorted cell would knock you down to ~4v, making it obvious your battery is toast. How Do I Revive a Dead Battery? The Battery Life Saver electronic device can be used to revive a dead battery that has accumulated too much sulfate build up or has been allowed to sit unused for a long period of time. charged battery, started up ran all day. This battery should be a deep cycle type and sized to meet your run time expectations with the engine off. You can fix rechargeable batteries once they fail to. 5 years old (mid-range diehard). I desperatly need help my battery on my 1999 Suzuki gz250 isnt charging up anymore and i have no clue what it could be, i have checked the stator and rectifier regulator, the test on the stator showed not grounded and pin to pin showed 00. Spare yourself the stress with a good battery charger, which can protect your vehicle's power supply from running dry and keep you from getting left the lurch. But I'm afraid when I do use the ATV/battery I'm beating it like a rented mule. Ideally, the electrical system will produce more energy while the UTV is running than it actually requires. A typical motorcycle charging system is shown in Figure 5 below. Battery charging issue. 1 means the battery is run down a bit or is bad. Let's make sure you have a battery that will hold a charge. 6 volts to 12. If the battery has come of age, it is dead. Just connect a voltt meter across the battery. While it is charging you can look at the charging system of the lawnmower. Battery Reconditioning Step-By-Step Free A Step-By-Step Guide Battery Reconditioning, Battery Desulfator. Shop for F2 True Wireless Binaural In-ear Earphones Stereo Bluetooth 5. If the alternator is faulty, your battery will no longer receive a charge and is moments away from being totally kaput. Where an Alternator is made to charge up a battery and keep it charged. It’s better to not fully charge or fully drain your battery. If the battery won't even take a charge, it's almost. People often think that a dead battery should be discarded and pay huge bucks to buy a brand new one. The battery charge time increases significantly. While this is one option to retrieve. A fully-charged battery should maintain the 12+ volts for weeks or months if there is no excessive drain on it. Replace the caps of the fluid chambers and reconnect the battery to the motorcycle. Answers are designed to ©2009be generally informative and do not Versionconstitute a warranty implied or otherwise. Check bike vitals like battery charge status, see its location on a map, and get security alerts if it’s been bumped, tampered with or moved. If you're reading this article, your bike ain't starting, and you can't take a ride for at least a few hours and that makes me sad for you. Rechargeable batteries are a popular and cost-saving choice to power tools, games and appliances. It is a new My motorcycle is not charging the battery. Not only that, but that the battery would not “take a charge” after this occurred. Put it in this year, didn't start. While different batteries can have enormous capacities, eventually the headlights, heater, stereo, nav, and infotainment would all drain the battery of power. Jumping a dead car from a running motorcycle can be done, but you risk depleting the bike battery so far that it may not start up again, so leave the bike running while you connect the cables. from just leaving the key in the ON position?. yesterday it wouldnt start so i charged the battery until the charger turned off b/c it was at full charge then it started fine and i waited a while and started it again perfect. We offer free information on how you can revive different battery types. The battery charge time increases significantly. The Harley-Davidson 800mA Waterproof Battery Tender (P/N 66000004, $49. Battery will not charge. ; Dim lights. A battery saver – These are one of the best inventions ever if you are someone who doesn’t ride every day. It's safe to jump start using the battery in your car, but make sure you don't have the car's engine running. After I safely made a complete stop I was able to fire her back up no problem. I performed many of the methods out there. We then need to understand why the battery is not at full charge. If you have a dead motorcycle battery that won't accept a charge, the problem is normally sulfation. Simply put, Magneto charging systems make use of permanent magnets imbedded into the flywheel assembly. Any one of these symptoms can be a sign of a weak charging system. Try removing the battery and charging it fully. Depending on your motorcycle, it should take about a couple of hours to charge a battery to full using a Level 2 charger. 6 volts to 12. This solution completely bypasses the stator by using a 12 volt battery to power the ignition system. i tryed this with a working battery because my charger got broken and the only system i had to play gba games on was my sp so i tryed charging it from 2 AA batterys and it made the battery bulge + it says on the battery to only charge it with a ags 001 or a ags 101. a battery charger will resume charging. The best rule: "If you drive it that day, charge it that night". 7 volts The Battery. Most of our Batteries are lead/acid types. AutoZone also offers overnight battery charging for 6 or 12-volt lawn and garden, motorcycle and marine batteries. I also used to have to replace my riding mower battery every spring until I bought a handful of those Harbor Freight battery minders. ** Topping charge is applied on a battery that is in service or storage to maintain full charge and to prevent sulfation on lead acid batteries. Running a sprayer and the cooling fan cannot be easy on a battery with the limited charging capacity of a stator system. Also remember that most boat motors do not have full charging amp output unless they are running at wide open throttle. Negative battery wire and post getting hot - posted in Virtual Mechanic: Anyone have any ideas as to why my negative battery cable is getting so hot while the engine is running? Any help appreciated. Do not drive the vehicle until the battery dies; lead-acid batteries won’t last as long if you completely discharge them. External charging – “How long does a motorcycle battery last?” has a lot to do with ensuring that you never let the battery run low. Probably more like 12 to 15 amps for an HOUR. Sound like the magneto is not charging the battery properly, and your bike is then running off the battery while running, sending it flat. Any one of these symptoms can be a sign of a weak charging system. Motorcycle Chargers for Long Life.