US Patent 8366371 Industrial battery charging, storage and handling system

A battery movement, storage, and charging system for large size batteries used in lift trucks includes spaced, parallel storage racks, each of which have multiple storage and charging bays. A battery transport tower is positioned in an aisle between the storage racks and is moveable horizontally between the two rows of racks. The tower includes an extendable fork lift mounted which may rotate around the axis of the tower as well as move vertically upwardly or downwardly on the tower. A battery exchanger loads a discharged battery from a lift truck, places it on a pallet and then transfers the pallet and battery to a transfer bay in a storage rack where the tower forklift moves a pallet and battery to a selected charging bay.