Model Boat Mayhem
Technical, Techniques, Hints, and Tips => Batteries & Chargers => Topic started by: Detomo on November 25, 2023, 12:34:26 pm
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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
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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
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Short answer- No.
Where are you based? I may be able to assist with a cheap replacement
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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.
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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
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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.