It is a 4 pin head battery. Suitable for RQ P90 Gel ball blaster.

7.4 Volt Blue Lithium Battery + USB Charging Cord for Gel Ball Blaster

Please double-check if this battery can fit into your blaster battery compartment first and, also what pin your blaster is before you buy our batteries.

Length: 5.2cm Depth: 1.5cm Width: 3cm

Please do not charge the battery to the wall, whilst the black connection pin is plugged into the blaster.