Slim battery. Rectangular battery with four contacts on bottom
Battery-Biz DRC511RES, 1400 mAh, 7.4 V, Lithium-Ion (Li-Ion)
Battery-Biz DRC511RES. Battery technology: Lithium-Ion (Li-Ion), Battery capacity: 1400 mAh, Battery voltage: 7.4 V. Weight: 167 g