Thread: Deep Cycle 12V Caravan Battery

Originally Posted by Bos

Appreciate all the comments and advice.
As it was given to me, got nothin to lose in trying to restore it.
I was told that a 24v charge into it for the first 12 hours would restore it enough to then handle a 12 v charger. At any rate, I'll give a few of the above options a go and see what happens

Err no. If its a flooded deep cycle 12 volt battery putting it onto 24 volts will just boil off all the battery acid and fuck the battery properly. I HAVE put a seemingly dead 12 volt deep cycle onto 24 volts, but only till the ammeter showed it was taking a charge (15-30 min). Then back onto the 12 volt program.

If its a more expensive gel or AGM, the battery will simply start bulging (hence Mimms2 wanting a video taken) or squealing. The resultant gas bubbles in the gel push the gel away from the plates, and that part of the battery can no longer hold a charge. So your 100ahr battery rapidly becomes a 25ahr one.

I've always wondered about those desulphaters??? as that's the untimely end to most batteries. Sulphation.