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tony.g



Member Since: 25 Aug 2017
Location: uk
Posts: 21
12v Battery Query.
Hi,
Have a perfectly good 12v battery which I want to keep as a spare. Is it best to keep it always fully charged (and how often should it be charged?), or is it best to occasionally run it down and then re-charge?
Thanks.
Post #658410 19th Oct 2017 5:23pm
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zsd-puma



Member Since: 09 Aug 2016
Location: Kent
Posts: 2720
United Kingdom 2010 Defender 110 Puma 2.4 USW Santorini Black
A decent maintenance charger is best for them. There are various smart chargers available, Lidl often do a cheap one. But there are also solar chargers which are quite good.

Failing that giving it a gentle over night charge with a normal battery charger once a month should keep it reasonably healthy.

They don't normally fare well if you just leave them to run flat and store them flat, that normally kills them pretty quickly.
Post #658414 19th Oct 2017 5:37pm
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pannawonica



Member Since: 21 Nov 2010
Location: Clackline Western Australia
Posts: 568
Australia 
Batteries tend to discharge more either side of @24 degC, not liking extremes of temperatures!👍
Post #658489 20th Oct 2017 1:30am
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miker



Member Since: 13 Sep 2015
Location: Surrey
Posts: 1763
United Kingdom 1999 Defender 110 Td5 CSW Rioja Red
Assuming a lead acid, leave it on a ctek permanently, it will take care of the rest!

Equally, I have had batteries sat spare and just charged them every few months, and not noticed any real deterioration
Post #658678 21st Oct 2017 12:06am
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tony.g



Member Since: 25 Aug 2017
Location: uk
Posts: 21
Thanks all for responses - will take onboard.
Post #658682 21st Oct 2017 5:25am
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