The MOTOPOWER MP00205A 12V 800mA Battery Charger allows you to connect the charger to the battery and leave it for maintenance indefinitely. It is the direct factory specializing in the electrical products and accessories for the automotive and Powersports industry, such as battery chargers, battery testers, and cell phones - all the products are designed, produced, and sold directly by the manufacturer' motor power you can get the best products here at the most competitive cost directly from the factory on amazon in the Absorption Mode, the charger will give a 0.5Amp pulse current to charge and recover the battery until it's fully charged. For several times charging, your battery internal resistance is lower and the performance is improved - do not suggest charging dead batteries if you're not sure how to use it on 'on-the-go.