Patent ID: 8679666

Claim:
A battery pack, comprising: a case that contains multiple sub-packs, each sub-pack including parallel groups and series groups, each series group including batteries connected in series, each parallel group including batteries connected in parallel, each parallel group including one of the batteries from each of the series groups; an electrical connector that includes electrical terminals, the electrical connector configured to be removably coupled with a second electrical connector such that the electrical terminals come into electrical contact with second terminals included in the second electrical connector, when the electrical connector is not coupled with the second electrical connector a first portion of the sub-packs being in electrical communication with a first portion of the terminals in the electrical connector and a second portion of the sub-packs being in electrical communication with a second portion of the terminals in the electrical connector, the second portion of the terminals excluding the terminals included in the first portion of the terminals; a frame defining battery receiving compartments that are each configured to receive one of the batteries such that the frame immobilizes a position of each battery relative to the other batteries, the frame includes frame openings: inserts arranged such that one of the inserts is positioned in each frame opening; a first metal plate is positioned over the batteries, the metal plate includes openings through the metal plate; and fasteners that each extends through one of the opening through the metal plate and into one of the inserts.