If you have vehicles in storage or you often forget to turn your lights off, a trickle charger can come in very handy for preventing a battery drain.
A car battery trickle charger is a charger that helps maintain the power of your battery and prevent self-discharge so you never end up with a battery that is flat. It charges slowly at a very low amp.
Be aware that this type of device can also lead to overcharging your battery if it is left on for longer than necessary. Thus, it is recommended that you choose a trickle charger that automatically shuts off when the battery reaches a full charge. Otherwise, you will need to monitor the battery and disconnect the charger yourself.
Since trickle chargers are not generally equipped with this automatic feature, you may want to consider going for a float charger (also called a “smart charger”). Float chargers always turn off when the charge is complete and start again when the charge goes down.