【Battery Model】BDC72 【Specifications】Voltage: 7.2V, Capacity: 5986mAh 43.09Wh 【Battery Type】 Li-ion 【Fit 】For GM-52 Total Station 【Package list】2 X BDC72 Battery * 1 Charger CDC77 Battery Charger Specifications Compatibility: for Topcon for Sokkia Li-ion Batteries: BDC70, BDC71, BDC72 (Part No. CDC77) for Topcon Total Stations: Hiper V, GM-50, GM-52, GM-100, ES/OS/DS/PS Series, TP-L6 Pipe Laser For Sokkia Total Stations: CX/FX/SETX/SRX/SX/iM-50/100 Series, SET 230R, 300, 330, 530, 630 Features: Dual-slot design for simultaneous charging of 2 batteries Power Specifications: Input: 110-240V AC, 50-60Hz, 0.8A Output: DC 8.28V, 1.2A Package Included: 1 Power cord