CTA Digital DB-CANP40 NP-40 Rechargeable Lithium-Ion Battery (1300mAh, 3.7V) Replacement for Casio NP-40 Battery Replaces The Casio Np-40 Battery 1300mAh, 3.7V Retains full capacity, free from memory effect Lithium-ion for maximum battery life power 3 Year Warranty