Pentax Optio S1 Digital Camera Battery Lithium-Ion (3.7v, 800mAh) - eplacement for Pentax DL-i78 Battery Replacement battery for the Pentax DL-I78, Lithium-Ion (Li-ion) 3.7V (800mAh) 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark