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. 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 state during long period st