Patent ID: 7576515

Claim:
A battery adapter system that allows first and second batteries having different sizes and different voltage outputs to power an image-intensifier device for a night-vision scope, comprising: a housing that includes a body portion having a central axis and adapted to axially accommodate through an open end either the entire first battery or a portion of the second battery, which is taller and thinner than the first battery, and to establish electrical contact with whichever battery is used; a reversible cap with a closed end, an open end and an interior, the cap being adapted to threadedly attach to the body portion i) in a first orientation that forms a first sealed housing interior that does not include the cap interior and that operably houses the first battery, and ii) in a second orientation that forms a second sealed housing interior that includes the cap interior and that operably houses the second battery; and a voltage regulating circuit electrically connected to the battery within the housing and to the image intensifier device and adapted to provide a substantially constant output voltage of 3 VDC to the image intensifier device based on an input voltage from said battery, which input voltage can range from about 0.6 VDC to about 3 VDC.