Drained battery

Ottocle · Two Stroke Sniffer Joined: 30 Jul 2013 Karma :

I recently replaced the regulator/rectifier on my bike and now, when using a multimeter, the volts are at 13.9/14v. The battery voltage doesn't drop below 9.6 when the bike is being started either. My problem is that my bike still wouldn't start this morning. The more I tried the flatter my battery became. I then charged my batt up and my bike started - all readings are as they should be. What could be stopping it from started properly without me charging it!

CaNsA · Super Spammer Joined: 02 Jan 2008 Karma :

The genny could be buggered.

J.M. · World Chat Champion Joined: 27 Mar 2011 Karma :

Possible that the battery is dead. If you're getting almost 14v when the engine is running, the charging system appears to be working.
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2004 R1 & 2018 XSR900

WD Forte · World Chat Champion Joined: 17 Jun 2010 Karma :

Yep
agree
It sounds as if the charging system is Ok but the battery isnt holding a charge.
The colder weather isnt helping either, lead acid batteries dont like the cold and can lose about 30% of capacity in some circumstances
you dont say what bike but the smaller bike/scoot batteries dont usually have a lot of spare capacity to begin with
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bikers smell of wee

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

If its an unsealed lead-acid, check and top up the electrolyte in the cells. It's easy to do, and easy to not do.
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike