Synergy Digital, replacing 1600mAh 7.4v BLS-1 BLS1 PS-BLS1 Li-Ion BATTERY for OLYMPUS E-400 / E400 E-410 / E410 Digital Camera Replacement battery for the Olympus B-LS1, Lithium-Ion (Li-ion) 7.4V (1600mAh) 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark