SOHC.co.uk Forums > CB350/400

Duff battery but 12+volts

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billdn:
A battery I've had on trickle charge for a while, battery make is Motobat has a charge of 12.7/12.9volts but when fitted to the bike won't even turn over starter but another one which is fitted, albeit newer is showing 12.5volts but starts bike fine - I'm confused!
Has the prolonged trickle charge on the old battery - maybe a year on charge done something to the power of the battery but not the voltage?. I've heard Motobatt batteries can just die but why the charge in it?

TrickyMicky:
The voltage is only the 'pressure', it does not reflect the amount (amps) of electricity in the battery. Fair chance that the plates are pretty well sulphated. Have used one of these 'battery conditioners ' in the past and suffered exactly the same fate as yourself. A normal lead acid battery thrives on being discharged very slowly and then re-charged slowly, the to-and-fro effect keeps the plates quire clean.  If there's anybody on here who's as ancient as me they might recall when your elderly aunt had a radio that ran on an accumulator which was just a lead acid cell. The radio used to discharge it very slowly, and when it was flat the man used to come round and swap it for a fully charged one. They lasted for donkeys years.

robvangulik:
When measuring the Motobatt while (attempting to) start, you'll probably see the volts disappearing before your eyes, which is a clear indication it's life is over.

Johnwebley:
I had that happen to a Motobatt.

Since then I  just charge, and then disconnect.

In storage, just leave it, and trickle charge every couple of months

Sent from my SM-A750FN using Tapatalk

K2-K6:
You could take it through a few discharge and recharge cycles to see if it responds in any way.

Just connect a side light type bulb to it and leave it to flatten over a 24 hr period,  then charge again.

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