Energizer ENB-SBG Digital Replacement Battery NP-BG1 for Sony DSC- T20, W80, W55, W150, W220 and W290 (Black) Replaces the Sony NP-BG1 Li-ion Battery Battery Specs: 3.6V 1100mAh Compatible with Sony DSC- T20/W80/W55/W150/W220/W290 and similar camera models Can be used with original lithium-ion battery charger This Li-ion battery is 100% memory-free and will not suffer from the inconvenient memory effects that are typically associated with similar battery types.