This is an accessory for Micrologic trip unit for Compact NSX and PowerPact multistandard devices. It is an external battery used for the local inspection and testing of Micrologic trip units. It enables to use Micrologic display screen and keypad even if the power supply to the Micrologic trip unit is interrupted. The pocket battery is connected to Micrologic test port with the trip unit connector (supplied with the pocket battery). Additionally, the pocket battery embeds a plastic screw-driver for the rotary switches settings and a flash light.