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OldGreyFox
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OldGreyFox is offline
South Yorkshire
Joined: Feb 2015
Posts: 21,202
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29-12-2020, 10:52 PM
11

Re: Car Battery Charging

Originally Posted by scot37 ->
If you cannot remember getting a new battery fitted it looks like you will need it replaced. I had to replace my one which had given me 10 years service.
Yep, if it doesn't hold it's charge chances are it might be ready for retiring. Ten years is good for a battery, I also had to replace mine last year after 9 years.
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Bruce
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Wollongong, Australia
Joined: Apr 2012
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30-12-2020, 01:56 AM
12

Re: Car Battery Charging

Measure the terminal voltage - if it is a normal flooded lead acid battery then anything over 12.7v is a good fully charged battery. Measure the voltage after it has been resting for a while. If it is 11.8v or less (after charging) it is rubbish

You can also measure the voltage when it is on charge if it is a trickle charger then (from memory) it will be about 13.4v perhaps a touch less depending on how sophisticated it is. If it is a smart charger then it could be different to that depending on the stage it is at.
 
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