DSTE Pro HLD-7 Vertical Battery Grip + 2x BLN-1 + DC133 Travel Charger Adapter for Olympus E-M1 SLR Digital Camera A firm, comfortable grip for vertical-position shooting with the Camera. Buttons and controls are conveniently placed and easy to reach for greater comfort. Holds one Li-ion batteries for extended shooting Li-ion Battery Info: DC 8.4V (max); DC 7.2V (mean) 16.0Wh/2100mAh Travel Charger Input: AC 100-240V 50/60Hz Output: 8.4V 0.6A Remaining power indicator