AdirPro BT 24Q NiMH Battery for Topcon GTS 300 Total Station with BC 20CR Charger Battery is equivalent to Topcon BT-24Q battery, 2-hour charging time 7.2 Volts, 2700 mAh capacity, Compatible with Topcon GTS-300 total station Charger is equivalent to Topcon BC-20CR charger 3-hour max charging time, Input: 100-230V; 50-60Hz Output: 9V Charges a single battery at a time, Works with Topcon BBT24Q and BT30Q batteries