Sony-Ericsson Equinox, W380, W518a, W910, W910i, Z555 battery, Lithium Ion (Li-Ion), Standard Battery is Nearly equivalent to Sony-Ericsson 1202-2547, BST-39 battery, , Aftermarket battery is rated at 800 mAh, and keeps a Standard profile on the Sony-Ericsson Equinox, W380, W518a, W910, W910i, Z555 cell phone since it does Not require any larger battery door, Powerful Lithium ion battery technology has no memory effect either! , Light weight battery is approximately 2/3 the weight and size of a Nimh battery of the same capacity!, This standard duty battery gives satisfactory talk & standby times!, Note that a new lithium ion battery"s full performance is only achieved after 2-3 complete charge and discharge cycles, , Our One year warranty is easier than the factory warranty if you should need it!, Supported Models and Categories:, Sony-Ericsson W910i Cell Phone Accessories SKU: PCERIW518ST