SDNPQM71D Lithium-Ion Battery - Rechargeable Ultra High Capacity (7.4V 2800 mAh) - Replacement for Sony NP-QM71D Battery Replacement battery for the Sony NP-QM71D, Lithium-Ion (Li-ion) 7.4V (2800mAh) This Synergy Digital battery is fully compatible with the original Sony NP-QM71D Battery. You can rest assured that this battery will work with your Sony Camera/Camcorders that use NP-QM71D and it can be charged with the original manufacturers charger. We use only high quality Japanese cells, so you are sure this battery will last for years to come. Synergy Digital is a very high reputable company that manufactures batteries and other electronic accessories for over 2 decades, all our products come with a 3 year manufacturer warranty.