Yahoo Answers is shutting down on May 4th, 2021 (Eastern Time) and beginning April 20th, 2021 (Eastern Time) the Yahoo Answers website will be in read-only mode. There will be no changes to other Yahoo properties or services, or your Yahoo account. You can find more information about the Yahoo Answers shutdown and how to download your data on this help page.

My motorcycle battery keeps going bad?

I have replaced the battery on my motorcycle numerous times. I just got it out of the shop for electrical problems. When I took it to the shop, it had a shorted battery and a bad negative battery cable. The cable and battery were replaced then. Also, my run-turn-brake module was bad and my s&s ist ignition module was shot. All of this has been replaced. I have always had battery issues with this bike. Once I found out the cable was bad, I chalked all of my battery issues to the cable. I got the bike out of the shop 2 weeks ago.

This past week I had to ride it work, because the fuel pump went out on my truck at work....where it still sits. Ok, I will just take the bike. These last two days, the bike has gradually gotten harder to start(when the bike has sat for ~12 hours). I live in Texas so the outside temp is pretty hot now. I would be at a red light and I would smell this terrible odor. This is the first time I have smelled it. The bike is air cooled and of course would start to get hot at the light. Normal. But the smell?? Only when the bike was getting hot.

Ok..so now here is the deal. I drove it to work last night and got off this morning. Dead!! I pulled the seat off and saw like a rust color around the positive terminal and what appeared to be some type wet material...not much though. I rubbed it and smelled my finger. Bingo!! There is where the smell was coming from. Its a gel battery. Ok, so now I have a 1 month old brand new battery, that has only really been used a week straight, that is fried!!! 1 week worth of use. The past batteries would go around 4 months. And I now have 2 vehicles broke down in the parking lot at work.

This is the first battery that has actually leaked on me. I had another one that I returned and the battery place said that it was actually exploded internally. The others would just eventually short. What would cause this?? Another question....the starter is a ultima thunderfire 2.4KW starter, which requires 300amps. My battery is only 325amps. Could this be the reason why I keep toasting batteries? Sorry for the long post. I wanted to give some history of my issue.

Update:

The charging system was verified at the shop. No issues.

Update 2:

I checked the charging system also. I replaced the regulator then. After that it was fine. This was done about a year ago. Not sure if the shop checked for shorts. I doubt it.

6 Answers

Relevance
  • Dan
    Lv 7
    8 years ago
    Favorite Answer

    Sounds like something is shorting out the battery. Here's a link on how to test to charging system - http://www.ehow.com/how_5475989_check-voltage-regu... - The shop might have done it, but I would check it yourself. IF the regulator / rectifier is allowing to much charge back into the battery, then it could fry it. Also, did they check for drains on the battery when the bike is OFF?

  • ?
    Lv 7
    8 years ago

    if it shows, while idle and reving, 12-14 volts, then likely the current limiting circuit of your regulator/rectifying unit is bad. charging a battery at a fast rate is never safe for the battery in the long run. charging a battery too fast will fry it eventually.

    I have a AA battery charger that has a current select feature of 100mA, 200mA, 500mA, 750mA, and 1000mA. I always choose the lower current rate, which will help prolong the life of the battery.

    For example, where your motorcycle battery needs a charge rate of a few amps to charge it back up without frying it, instead it's likely being charged back at a 100Amp rate.

    Speed charging will kill.Slower charging is recommended.

    Source(s): 19 year electronic technician / 20 year motorcycle wrencher.
  • Andy
    Lv 7
    8 years ago

    My guess is that you have a problem with your charging system. Most likely is a bad voltage regulator. If the charging rate isn't properly regulated it will cook the electrolyte out of the battery killing it. You could have a short in the wiring giving you problems also. In that case though you'll usually get blown fuses.

  • 8 years ago

    As Andy stated, the voltage regulator/rectifier is pumping too much juice to the battery.

  • How do you think about the answers? You can sign in to vote the answer.
  • ?
    Lv 7
    8 years ago

    You either have a bad stator or a bad voltage regulator. I don't care what the shop "verified".

  • Anonymous
    8 years ago

    i thik you may have charging problem

Still have questions? Get your answers by asking now.