Print

Please login or register.
1 Hour 1 Day 1 Week 1 Month Forever
Login with username, password and session length.

[Detomo]

Hi peeps,
I have a flat 12v battery, that does not take a charge. Has anyone got any ideas how to revive it and put some life back in it.
Yours Tomo

[JimG]

If you look around you will probably find some methods on You Tube, one that some try is to start the charge with a high voltage charger for 24V  to try and shock it. WHatever method you could try however it's not really worth it, even if it takes a charge it will be low capacity and low output. If the battery won't take a normal charge it is basically dead and best disposed of and replaced.
Jim

[Andyn]

Short answer- No.


Where are you based? I may be able to assist with a cheap replacement

[grendel]

on occasion I have revived lead acid batteries that have been over discharged recently back to life by just connecting them to a solar panel, the cycling of charge over a few days / weeks can sometimes get them back, but its no guarantee, if the lead acid has been discharged for a longer time its almost inevitably dead.

[Hurric123]

The charger probably needs to see voltage before it will produce a charge. You will need to connect a similar voltage battery in parallel then take the second battery away once the charger has put some voltage in and the charger should then carry on charging the original one

[DHutch]

Depends slightly if its been heavily discharged as a one off fairly recently, in which case you might be able to revive it by pushing enough voltage in to the get the smart charger to detect it. Either with a dumb charger, another battery (inc your cars starter battery), or a smart charger with a 'from flat' function.


However if its been in a shed for 5 years, weight it in for scrap and buy a new one I think! Especially if its a smaller/cheaper one.