Battery equalizing system

Claim 1

A discharger comprising a housing having a recess therein to receive a battery cassette holding therein a plurality of series connected cells, cassette engagement terminals, at least one of which being movably provided in said recess, a plurality of cell contact terminals each cell contact terminal contacting a single terminal from a respective one of the series connected cells held in said cassette, and self-discharge circuits formed between said terminals for permitting the discharge of the cells therethrough and for stopping the discharge of current at a predetermined voltage level which is lower than the charged voltage across each cell, inclusive of zero voltage, said self-discharge circuits each including, in series, a load circuit and a voltage controlled switch conducting above said predetermined voltage and non-conducting below said predetermined voltage, and, further comprising a fan for removing heat developed in said self-discharge circuits during discharge of cells, said fan being driven by the terminal voltage of the cassette mounted in the recess and stopping when the cells stop discharging.