AOLIKES 3.7V Replacement Battery 1200mAh - PL 353582 for Wireless Bluetooth Keyboard, Video Game Pocket Electronic Readers and More 3.7V rechargeable replacement battery 1200mAh, Fit for wireless bluetooth keyboard , Bluetooth Speaker, MP3, MP4, GPS, PDA, e-Books and a variety of electronic readers and more. Nominal voltage 3.7V, fully charged, 4.2V, 1200mAh capacity of battery, Power 4.44Wh, item model PL353582, Built-in battery protection circuit module to prevent overdischarge and short circuit of this battery. Battery size: 82 x 35 x 3.5 mm / 3.2 x 1.38 x 0.138 inch (L*W*T) Connector Type: 24# wire, length: 2 inch, Before replacing, please contrast with the old battery and check the polarity of the battery. Red wire connection power positive " +" , Black wire connect power negative pole "-".