Quote:
Originally Posted by Bandit127
Yes, I think a 12V battery with 8V on it is ruined. Anything less than about 12V won't come back in my experience. It will take a charge and look like it has 12V or so on it but that will quickly drop back - even if it is off the bike.
Bike alarms (for example) use the right amount of low current to deep discharge a battery over a few months. My rarely ridden ex-wife's SV650 killed 3 or 4 batteries in a row before I removed the alarm. Job done then and it was fine not used for months after that.
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Had the same problem with a b---stard data tool alarm. got rid of it. Bike much nicer to live with now
To test battery, charge it up then disconnect one side (earth) or teh other so the battery terminal has no wires on it, wait to see if it discharges itself, if so you need a new battery. if not the something is stealing power.
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