The Fenix USB ARB-LP1900 rechargeable battery is designed to power several Fenix headlamps. It has 1900mAh of capacity and produces 3.8V volts. Purchase this battery as replacement of backup for the following products: HL18R-T V2.0, HL32R-T, HL45R, CL20R V2.0, CL20R PRO.