Batteries can be recharged because the chemical reactions they use are reversible; they are recharged by running a charging current through the battery, but in the opposite direction of the discharge current. Rechargeable batteries can be charged hundreds of times before wearing out; and even after wearing out some can be recycled.

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Always keep your battery terminal ends clean and free of corrosion on the inside as well as out. You can use boiling water to remove the majority of the corrosion and then follow up with a wire brush. On some model cars equipped with anti- theft system it is important to have your security codes before you disconnect your battery or you may not be able to start your car. Another way is to attach a battery charger to the battery cables before disconnecting the battery to allow power to the vehicles computer during battery maintenance