Features 100% Brand new! Ideal smart watch battery substitute, let your smart watch rebirth. High capacity 380mAh lithium battery, with good performance and ultra stable. Standard size, just fit for smart watch DZ09 & more, just input and play. Easy replace and install, no other tools needed. Specifications Material: Lithium polymer Capacity: 380mAh Internal Resistance: =150mO Rated Voltage: 3.7V Charge Voltage: Max. 4.2V Operating Temperature: 45° Compatible Model: Smart watch DZ09 & more smart watch.