You must ride it to produce a load on the electrical system, or at least run the engine at a cruising RPM, for quite some time to produce the 13.5-14.5 volts required to charge the battery back up. The second replacement whistled/hissed, then made a pop like a firecracker when it died. All you need is a digital voltmeter. It had 4.8 volts. What we're dealing with here with a lead acid battery is a plastic box that encases a delicate balance of chemicals which are ready to interact with each other to produce electricity when the load is applied. What do you mean you don't have any test bulbs?! I have measured the Milliamps (draw on circuit) using the DCA Setting on 20m, with tester in circuit, and i’m getting a reading of 11.24? Name Should contain only letters, numbers, and (' - .)! A small question for the experts here: Which means you should charge your battery overnight, and then let it sit for a couple hours. Sometimes it is the fitting where that wiring goes through the case. Most motorcycle batteries are lead-acid batteries and should be charged in addition to the charge it receives from your riding. I bought a 1.5W solar trickle charger for my 12V motorcycle battery, as it lives in a shed away from our house. We call this the open cell. Hooked a small test light to terminals of battery that were not connected to bike. If you have something like a 6-amp charger that you want to use on your 20-amp battery, you'll need to connect two bulbs in parallel. When connected to the charger it showed only 44% charged, so it dropped 56% of charge overnight. Sometimes it's obvious if there is a failure, but other times it's not. If the battery is still intact, but there is a bulge in the case, this is usually a result of being overcharged. Don‘t drop me from your list. Make sure your charger is the same voltage (6 Volt or 12 Volt) as the battery you are charging. You can't use up half now, and then wait and use half later. Your local automotive shop is more than able to load test your battery for you. There is no visual damage to the battery. Line up the notch in the charger plug with the notch in the charger port and plug into the charger port. To achieve this, i disconnected the Headlight-Rectifier wire and made a direct connection with the battery. Then turn the charger off, remove the Leeds, and replace the cell caps. Inspection of battery is essential before replacing Harley starter. My car wouldn’t start earlier today, so I checked the battery, and there was a weird bulge in the case. If the battery dropped to 12.4v or lower, it would be considered a weak battery. These 3 steps will help you determine if your battery is bad or not. If the battery is fully charged (according to the battery charger) but the voltage is 12.5 or less, the battery is sulfated. Battery won't hold charge over night, so I disconnected from the vehicle, charged to a full charge, let it stay disconnected overnight and next day after 18 hours the voltmeter indicated 11.7 volts. What’s that you say, Bunkie? Typically a test lamp, turn signal or brake light bulb draws about 2.25 amps. That produces a lot of heat, and sometimes even causes the battery to explode (no joke). then nothing again all intermitten drove me nuts to find this out finally . However, if you are not able to I wouldn’t recommend just letting it sit more than a couple of months, or the sulfation that is building up in the battery will start to harden. Motorcycle Cruiser may receive financial compensation for products purchased through this site. After the failed attempt of trying to start up, I turned off all the power to the bike and took another measurement. Hold the prongs of you voltmeter to the correct terminals on the battery. AGM and gel cell batteries cannot tolerate quick speed charging like the standard battery chargers create. The only tools you really need are a battery charger and a digital voltmeter. RSS. The only tools you really need are a battery charger and a digital voltmeter. I would recommend replacing the battery. We've got a wide selection of powersports batteries for your motorcycle, ATV, scooter, jet ski, or snowmobile. Mechanic and automotive shops are more than able to load test your battery for you. Cracks, splits, and holes will not prevent a battery from working properly, but for safety reasons the battery should be labeled unsafe to use. For any load test to be accurate, the battery must be fully charged. Really great info! There are a few things to inspect: Broken or loose terminals are dangerous, and can cause a short circuit. Not everyone has access to a mains power supply but never fear – you can still keep your battery charged by using a solar panel. AGM and GEL cell batteries have a slower discharge rate than wet cells. To clear up a misconception: a battery isn't like a water bottle. On Load conditions, the battery shows a positive increase in Voltage upto 13.4 – 13.8V with rpm above 3000, I used the motorcycle at night and in the morning i checked the battery at no-load, it was around 12.42V. Josh, Large automotive-type battery chargers, designed to charge a good-sized car or truck battery, can easily overcharge a small motorcycle battery if you’re not careful. The charger can power up and maintain 12V and 6V batteries and has a relevant switch to choose the needed charging mode. I can tell you that the smaller group D34M Optima Blue Top is only a 55AH battery and could only last under load for about 12 mins before you start to excessively discharge the battery. It's been 3 weeks since my last ride and yesterday the bike wouldn't turn over when I tried turning it on (however the lights and dashboard did all light up). Hi, hoping you can help. 6 months? I’ve owned many motorcycles throughout my life and have become quite familiar with their charging systems. Really helpful post to knowing when battery goes dead. Well, it died hard alright, last two cells were dry to the bone! But for the sealed AGM and Gel batteries, it requires testing. Yes, it's a pain, but it's better than cooking your battery. The relationship between your motorcycle battery and engine functions much in the same way as a car battery. All you need is a digital voltmeter. I would suggest charging the battery, and once charged disconnect the battery from both bike and charger and let it sit for 12hrs. In general we recommend that if you are not going to use a battery put it on a maintainer. What we're dealing with here is a plastic box that encases a delicate balance of chemicals which are ready to interact with each other to produce electricity when the load is applied. I wished to connect the headlight directly to the battery supply and use a LED headlight(20W – low/30W -high). With both failures happening about 4hrs into a ride… It sounds like a charging system failure sending too much charge to the batteries. But for sealed AGM and Gel batteries, it requires testing. Hence, my headlight flickers (which is expected from AC supply). Before replacing the charger I would suggest going through the troubleshooting steps in the manual, as you may just need to rest the charger. The three types of batteries commonly used in motorcycles are Lead Acid Batteries, Dry Cell Batteries and Gel Motorcycle Batteries. Can you please clarify. Can i ask a question to you wonderful electrics experts. It was just the things I was wondering so I could determine what to do next. i disconnected every attachment from the harness and the 11.24 is made up of: If you get the same result it is most likely the battery. But if a battery sat, uncharged, severely discharged, and/or drained for extended periods of time, the sulfation will increase in size and harden onto the plates. Cracks, splits, and holes will not cause a battery to stop working, but for safety reasons the battery should be labeled unsafe to use. © 1997-2020 BatteryStuff.com LLC. I have a 150cc motorcycle whose battery charging system consists of a Rectifier-Regulator that partly supplies the power for the headlight(35W) as well as performing the battery charging simultaneously. Batteries with open cells may read fully charged in idle, but they fail under a load test. Info was very helpful. You can see all of the batteries that are designed for solar use at www.batterystuff.com/batteries/pv-solar/. It is a new battery which has been charged and tests fine. Thanks for the great post! Also, batteries don't "leak" power like water can. But it's quite easy to do at home. Thank you. Foval Automatic Trickle 12V 1000mA Smart Battery Charger. The battery is not charging when it is installed on the bike. If the battery is still intact, but there is a bulge in the case, this is usually a result of being overcharged. Charging a sulfated battery is like trying to wash your hands while wearing gloves. Unfortunately, in some circumstances, that may be the only type of charger available. If you look at a trickle charger, most of them have a 2 amp setting or a 6 amp quick charge setting which is what your motorcycle needs at the very least to obtain a constructive charge. Just a question about dry cells. Thanks for all the info. Load Test the Battery. The mechanism of a motorcycle does charge it’s own battery while the motorcycle is running. Now, a battery isn't like a water bottle. So you can pass it on to your customers and employees . If you find the battery is doing just fine you may have a parasitic draw that you need to track down. Really helpful, thanks. 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