Wentronic MP f/ ERI T28/T29(BUS-11) 850mAh Li-Ion. Battery technology: Lithium-Ion, Battery capacity: 850 mAh, Battery voltage: 3.7 V. Weight: 28 g, Width: 45 mm, Depth: 69 mm. Colour of product: Black. Dimensions (WxDxH): 45 x 69 x 10 mm