NOVELTY - A battery pack system (42) comprises a battery pack (2) comprising parallel groups connected in series, with each parallel group comprising batteries connected in parallel; and electronics that discharge the battery pack at a current level required to fully power device(s) that draw power from the battery pack, and to drop the current to lower current level while discharging the battery pack.    USE - Battery pack system for use in vehicles, i.e. trucks, cars and carts.    ADVANTAGE - The battery pack system provides equalized voltage. It can be sealed to include more or fewer batteries, e.g. number of batteries in each series group can be increased for applications that require higher power levels or decreased for applications that require lower power levels.    DETAILED DESCRIPTION - A battery pack system (42) comprises a battery pack (2) comprising parallel groups connected in series, with each parallel group comprising batteries connected in parallel; and electronics that discharge the battery pack at a current level required to fully power device(s) that draw power from the battery pack, and to drop the current to lower current level while discharging the battery pack. Each battery includes a burst disc, a current interruption device, and/or a positive temperature coefficient resistor. The lower current level is an open circuit current level for the battery pack, and below a recharge current at which the battery packs in a system parallel group are able to recharge other battery packs in the same system parallel group.    DESCRIPTION OF DRAWING(S) - The drawing is a schematic cross sectional view of a battery pack system comprising battery packs, and a controller in electrical communication with pack assembly.    Battery pack (2)    Battery pack system (42)    Controller (64)    Pack assembly (66)    Primary parallel conductors (68)    System series groups (70)    Primary series conductors (72)    Secondary series conductors (74)    Secondary parallel conductors (76)    Cross conductors (78)    Shunt circuit (82)    Switch (84)    Resistor (85)