NP-130 Rechargeable Lithium-Ion Replacement Battery Pack - (1800 mAh 3.7V) - Replacement Battery For Casio NP-130 Rechargeable Battery Replacement battery for the Casio NP-130, Lithium-Ion (Li-ion) 3.7V (1800mAh) This Synergy Digital battery is fully compatible with the original Casio NP-130 Battery. 100% compatible with your OEM battery - 3 year warranty. Made with high quality Japanese cells. Synergy Digital is a Registered Trademark