Battery for Microsoft Zune Flash 16GB 4G 4GB 8GB 30-Day Money Back Guarantee & 1 Year Replacement Warranty! Capacity: 600mAh 3.7V (2.22WHr) Dimensions: 43.16 x 33.36 x 3.37 mm (WxLxH) Condition: Brand New - 100% OEM Compatible Type: Li-Po