Make Sure Device Polarity Matches with Battery Pack Connector Before Purchase!!!-1.Battery Size; 2.Connector Model; 3.Connector Size; 4.Connector Polarity - This is not universal!!! (It will cause a shortage if the polarity of the battery connector does not match your device.) Basic InfoVoltage: 3.7V; Typical capacity: 2000mAh, Min capacity: 1900mAh; Weight: 40g; Battery size (WxLxH): 34.5 X 56 X 10.6 mm / 1.36 X 2.2 X 0.41 inch Reliable PerformanceNo leaking, excellent cost performance and long cycle life. PCM protection function: over charge, over discharge, over current, short circuit protection, over temperature protection. CertificationsUN 38.3 compliant. More than 400 EEMB batteries are UL certified. Search "MH20555" on UL for all EEMB UL certification information. Quality Service Please contact us if you have any questions or concerns with the product via message. We will respond to you within 24 hours. Storage & ApplicationKeep the cells in 40%-60% charged