PART NO : 1 - 853 - 336 - 11 FEATURES : 1. 100% brand new! 2. Mini 3.7 V, 390 mAh rechargeable Li-Po battery. 3. Miniature design, weighs only 1.6g and features high density. 4. Built-in intelligent PCB charging module, effectively avoids charging, over discharge, over current, short circuit. 5. This product is widely used in Bluetooth headset, Bluetooth speaker, selfie stick, smart watch, wireless mouse, mobile power player, MP3 and MP4 player and MP5 player, mobile speaker, amplifier, navigation system (GPS), toys and other electronic devices . ATTENTION : 1. Please allow small deviations in size due to human measurement. 2. Please keep your children out of battery range in case they are swallowed. 3. When the battery is not in use, it should be removed from the device. 4. Red and black lines should not be connected to avoid the short circuit after battery charging. Specification Model : 351547 Condition : New Type : Lithium battery Battery Capacity : 390 Mah Rechargeable : Yes Charging voltage : 3.7 ~ 4.2 V Working voltage : 3.7 V Working temperature : -10 ~ 50 ° Dimensions (L * W * H) : 45 x 11 x 5mm Condition : New QUANTITY : 278 PCS