Source - Business Upside
Car batteries rarely need to be charged externally because they go through a charge cycle and discharge while the car is being driven. However, external charging becomes required when the battery ages or if the car's alternator starts to malfunction. It could be fully operational again after removing the battery from the car and charging it for a few hours, but this could also indicate that a new battery is needed. This type of charging is only required when a battery is low or fails. Trickle charging, on the other hand, is a different kind of charging that is part of battery maintenance and helps extend battery life and prevent early death. You should know how to utilize a battery tender for trickle charging, which is covered in more detail below.
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