A connector has an insulative housing, a plurality of terminals and a metal shell. The multi-lamp backlight system includes a plurality of lamps, an inverter circuit and a current balance circuit. Door closure switches on a safety switch to activate safe charging of a rechargeable battery pack with matching one or more key slots. In this manner, a human replacing a lamp connected to the ballast can be protected from shock despite a failure to disconnect the power to the lamp ballast prior to lamp replacement.