The reloadable power supply for Lazer weapons
it is dark grey in colour and has a silver stripe around it. it is about 6cm in length and 2cm in diameter. It has the power link at one end and a butt plate at the other. Each clip produces enough power for 50 shots, varying on the weapon.
They are used alot in GAO. But they are almost always found powering lazer weapons.
There was no real origins to the battery clip rather then just a need to power lazer weapons.