You can charge the battery while it is still inside the car or if it has been removed, either method is fine.Lead Acid battery can be put to charge for an entire night. Even if it is overcharged then there is not risk of fire. ... Leaving these batteries on overnight charge will not do any harm as the charging process will be controlled by the charger itself. If you leave the charger connected continuously, even at a mere 2 amps, the battery eventually will die. Overcharging a battery causes excessive gassing — the electrolyte gets hot and both hydrogen and oxygen gas are generated. ... On sealed batteries, the buildup of gases could cause the battery to burst.A car battery trickle charger is an electrical charger that works at a relatively slow, steady rate. Distinct for its low amperage, the trickle charger gradually charges the battery as it depletes energy. ... Since the battery is connected to a trickle charger, its energy won't get drained even if it is rarely used.

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