Integrated battery contact and retentive protrusionUS5592064 *22 Nov 19937 Jan 1997Sanyo Electric Co., Ltd.Battery charging apparatus, power supply, and attachment for connecting different types of battery packs to a battery chargerUS5780993 *17 Nov 199514 Jul 1998Tsang; John Moong HungCombination battery charger and power source for electrically powered devicesJPH0512820A * Title not available* C