Patent ID: 8450004

Claim:
A battery power supply adapted for underground mining, the battery power supply comprising: a battery housing having a surrounding wall defining an interior space accessible through first open end, the housing including a battery housing lid releasably affixed to the battery housing for sealing only the first opening in the battery housing; a battery disposed in the interior space; an additional housing secured to the battery housing, the additional housing defining a hollow region separate from the interior space; and a circuit board disposed in the additional housing, the circuit board being in electrical communication with the battery by use of electrical connections extending through a second opening defined in the battery housing, the second opening being a pressure-resistant opening for the separation between interior space and the hollow region; wherein the surrounding wall, the battery housing lid, and affixment therebetween are such that the battery housing remains closed in an isolated pressure proof and gas-tight manner in the event that the battery explodes.