Patent ID: 7859220

Claim:
An electrochemical cell charger of the type that delivers a charge to an electrochemical cell, the charger comprising: at least one battery compartment adapted to receive an electrochemical cell, the battery compartment including: a positive charge contact having a ridged cell-engaging surface adapted to wipe a positive terminal of the electrochemical cell to remove oxidation from the positive terminal, the ridged cell engaging surface comprising at least two outwardly extending, spaced apart ridges, the at least two ridges having different lengths, each of the at least two ridges having longitudinal side edges and transverse ends, each of the transverse ends extending between and connecting the longitudinal side edges, the transverse ends and the longitudinal side edges defining a continuous loop; a negative charge contact adapted to wipe a negative terminal of the electrochemical cell to remove oxidation from the negative terminal; and wherein the charger is operable to provide the electrochemical cell an average charge current of at least 4 Amps.