There are many types of batteries depending upon the usage. For instance there are primary and secondary batteries, wet and non-wet (gel-type) types, conventional and maintenance free, and even wet-charged and dry-charged batteries. Moreover, there are many overlaps between these categories. For instance, a secondary battery can either be wet or gel-type, conventional and maintenance free.

A dry-charged battery is stored on the dealer's shelf without electrolyte in it. The dealer must put electrolyte in the battery and briefly charge it before installation in the vehicle.

A wet-charged battery is stored on the shelf with electrolyte already in it. It may require charging before dealer installation. Wet-charged batteries that are stored too long without periodic charging may become permanently damaged.

Dry-charged batteries have the advantage of a longer shelf life. Wet-charged batteries are usually ready to go from the dealer's shelf with little or no charging.

Maintenance free batteries are constructed differently than conventional batteries. They have lead-calcium plates instead of lead-antimony plates. This reduces the amount of electrolyte loss because there is less gas production. These batteries are wet-charged and have a longer shelf life due to a low discharge rate.