Cbr400rr battery swollen up.

rashid · Derestricted Danger Joined: 04 Jan 2010 Karma :

Came back from work one day just fine, parked the bike. Next day it didnt want to start. No sign of life. No indicator on the meter no nothing. Looked "obviously" like a dead battery. But why would it be? Just replaced it not more than 2 months ago.

With a heavy heart removed the seat to see the battery and there it was sitting all swollen up and fat. So its no more.

But why would this happen?? Its been perfect since it was changed. although it was not same size the original battery but that ahould not be a problem right?

So I want to ask is that is it being over charged or (most probably not) under charged?

Secondly how much voltage does the alternator need to spit out for the normal charging ? Also can anyone point out where else to look at in the bike for the possible issues.

Thanks.
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Honda CG 125

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Try replacing the regulator.

My SV made 2 batteries swell like a mother bitch Laughing

finpos · World Chat Champion Joined: 13 Sep 2005 Karma :

Look to see if you can find a fitting on the battery for a vent pipe. Then hope it's not still got a blanking cap on it that you were supposed to remove before fitting!

F.

rashid · Derestricted Danger Joined: 04 Jan 2010 Karma :

it was supposed to be a no maintenance dry battery.. do they need to be vented as well?
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Honda CG 125

finpos · World Chat Champion Joined: 13 Sep 2005 Karma :

If it's zero maintenance it will still have a vent - at very least for when it all goes wrong. Definitely check for over-charging either way.

f.

rashid · Derestricted Danger Joined: 04 Jan 2010 Karma :

tried the bike yesterday, all of a sudden the battery has come to life and everythings working. its cranking and lights are on and indicators working, but now it wont start! its cranking, but no life.

So being a noob, what you guys suggest where I start now (apart from starting a new thread! Smile

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Honda CG 125

Billing · World Chat Champion Joined: 12 Mar 2009 Karma :

I suggest you replace the regulator/rectifier, then get the proper battery on there (Tri-Arms are a YTX9-BS if memory serves)

You'll probably find that while the bike cranks, there isn't enough power to create a big enough spark at the same time. These bikes tend to need a really good battery otherwise they just crank over without starting. Try bumping it to see if it will start, if it does your battery is probably fucked (likely from over charging caused by a dodgy reg/rec)
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'84 TS50X, '91 TZR125, '89 CBR400RR, '91 VFR400R NC30, '98 R1
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