Sony Alpha a5100 Digital Camera Battery Lithium-Ion (1500 mAh) - Replacement for Sony NP-FW50 Battery Replacement battery for the Sony NP-FW50, Lithium-Ion (Li-ion) 7.4V (1500mAh) 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark