HP ST09 Extended Life Notebook Battery. Battery technology: Lithium Polymer (LiPo), Battery capacity: 6600 mAh, Battery voltage: 11.1 V. Weight: 0.55 kg. Colour of product: Black. Dimensions (WxDxH): 154.9 x 304.8 x 30.4 mm, Battery type: Lithium-Ion Polymer, Width: 154.9 mm (6.1 ")