Deep cycle NOT ebike battery question

handbaked

Pedelecer
Feb 27, 2015
166
15
Hi

I have an old 12v 120ah deep cycle battery that has not been used in ages (over a year). Is it likely dead if currently at low voltage?

Cheers.
 

Alan Quay

Esteemed Pedelecer
Dec 4, 2012
2,351
1,076
Devon
They can often be revived. Stick it on a charger for a few days and see.

If you want to be adventurous, you could attempt to de-sulphate with a short burst of a higher voltage. I've seen Utube footage of people doing this with 110v ac! (I don't recommend it though).
 

RobF

Esteemed Pedelecer
Sep 22, 2012
4,732
2,312
Make sure you use an ordinary trickle charger, not a so-called 'smart' one.

They read the battery voltage and will not give any charge if the voltage is too low.
 

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