The Nokia BL-4B is a high quality non-genuine replacement lithium-ion rechargeable mobile phone battery. This replacement battery is manufactured to CE & UL standards, is ROHS compliant & can be used as a cost effective alternative to genuine branded batteries. Specifications: 3.6v 600m Ah Compatible with the following mobile phone models: Nokia 2660, 2760, 6111, 7370, 7500 Prism Please note: New batteries will achieve optimum performance after two or three complete charge & discharge cycles. * Figures are approximate & are dependent on SIM card, phone model & settings, network & usage.