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my understanding is that using the 1/10th rule will maximize the life of the battery. The 2 amp setting on car battery chargers will work as long as it is "auto and not manual" the latter is very unsafe, I have seen quite a few bulging batteries caused by this. If you want to extend the life of the battery use the lower rate, we sell 1/2 amp and 1 amp smart chargers, meaning they know when full and switch to a pulse maintenance cycle like in a float charger.
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