This Sony NP-BK1 Rechargeable Lithium-Ion Battery f/Sony Cameras, for use in Sony DSC-W180, DSC-W190, DSC-S750 and DSC-780 cameras.

Sony NP-BK1 Features
Lithium Ion type K Battery
High Capacity of DC 3.6V
Slim Design
Weighs 20 grams
Suitable for Digital Still Camera