Review on BMK Trickle Car Battery Charger: 12V 2A Smart Pulse Repair for Boat, Car, Motorcycle, Lawn Mower, RV, SUV, ATV by German Diaz

As the name suggests, if you have a vehicle for 'occasional' use [ie my pickup truck!] manufactured in the last 8 years or so, you will need a battery maintenance tool like this. Otherwise, approach the car that has been stationary for a month and press the and button. empty battery. This is because modern cars draw little current even when seated with the key off, due to the small amount of current required to maintain the computer controlled settings. This charger is easy to use, does not overcharge the battery (which shortens battery life) and is reasonably priced.