Battery Giant carries a full range of Battery Chargers and Maintainers. Whether it is a small Power Bank to get your cell phone through a busy day, or a full sized Automotive Battery Charger, we've got you covered. We also stock several different Smart Chargers and Maintainers to help save your batteries during storage periods. These are excellent for cold weather climates where motorcycles and cars may be stored through the winter. A battery maintainer, also known as a smart charger or tender, does not just provide a constant trickle of energy to the battery as trickle chargers do. They take readings from the battery, and only provide current when it is needed. They also extend the life of your battery by preventing sulfation.