My invention relates to an improvement in the constant and extended supply of electrical power to night vision devices and the convenience of making use of a standardized, commonly available battery with higher reserve power for the same. Specifically, my invention provides an adapter that is placed into the battery compartment of an NVD, is securely fixed in that compartment so as to maintain electrical connectivity regardless of jarring forces it may endure, and contains a port into which the wire lead from an external power pack is plugged so as to provide the electrical power. The external power pack can be configured to hold the battery or batteries of choice, and can be made to attach either to the user's person or the same object that the NVD is attached to, such as a rifle. The external power pack will allow the use of batteries with a higher reserve power, or batteries that are rechargeable/reusable, and supports the user not having to carry a multitude of differing batteries in order to have spare power available for several different devices.
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