Patent ID: 7378756

Claim:
A plug containing a backup power supply comprising: A) a housing having (1) a first surface which is a front surface when the housing is in use, (2) a second surface which is a rear surface when the housing is in use, and (3) a third surface which is a side surface when the housing is in use; B) a plurality of electrical connector prongs on the second surface; C) a grounding electrical prong on the second surface; D) a plurality of condition indicator lights on the third surface; E) an electrical socket on the first surface, the electrical socket including a plurality of prong accommodating holes and a grounding plug; F) a rechargeable battery in the housing; and G) circuitry in the housing, the circuitry electrically connecting the battery to the electrical connector prongs and to the indicator lights, the circuitry sensing power applied to the electrical prongs and activating the battery when power applied to the electrical connector prongs drops below a preset level to apply power from the battery to the electrical connector prongs when the power applied to the electrical prongs drops below the preset level, at least one of the indicator lights being activated when the battery is activated to supply power to the electrical connector prongs, a second indicator light being connected to the battery to indicate power level in the battery.