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There are many different battery chargers on the market. I wonder if recharging car battery always works without needing replacement? If not, under what situation requires replacement?
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When it will no longer hold a chargei.e.trickle charge overnight,replace on vehicle.If it goes flat(assuming there is nothing draining it)then it is no good.
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Usually a battery that is near the end of its life won't accept much of a charge from a battery charger. The battery can be almost 'flat', yet when it is connected to a battery charger the ammeter on the charger barely moves off the stop. So "no", recharging a battery does not avoid replacement.
It's difficult to say exactly when a battery needs replacing. If symptoms are appearing of poor charge retention, and the battery is more than 3 or 4 years old, then it is probably due for replacement.
One test might be to try starting the car in the morning with the headlights and rear screen demister switched on. If the engine struggles to turn and the headlights go dim, the battery could be on its way out (assuming that the alternator is working OK).
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Everything you want to know about batteries at www.uuhome.de/william.darden/
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I suspect a lot of owners forget to check the acid level in their batteries occasionally. I also suspect that if they did, the battery might last longer. (some batteries are fully sealed though).
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A usefil tip with trickle chargers is that if the charge current drops all the way to zero then the battery is probably sound, however if (even after a day or more) the charge current stays at say 0.75 Amps or more the battery is probably on the way out.
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