This is a replacement Battery for the original Sony CyberShot Battery NP-BN1. It works with the Charger BC-CSN. Our NP-BN1 Rechargeable Lithium-ion Battery is more compact and lighter in weight than previous battery models. Its lithium technology feature provides 50% more exposures per charge than earlier models with virtually no increase in size or weight. and its high quality IC chips ensures maximum battery life. It has no memory loss effect that lets you recharge partially drained batteries without reducing performance. Low impedance battery design.