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.) RELIABLE PERFORMANCE—No leaking excellent cost performance and long cycle life. PCM protection function: over charge over discharge over current short circuit protection over temperature protection. CERTIFICATIONS—UN 38.3 compliant. More than 400 EEMB batteries are UL certified. Search MH20555 on UL for all EEMB UL certification information.//MANUFACTURER DIRECT— Please contact us if you have any questions or concerns with the product via message. We will respond to you within 24 hours. STORAGE & APPLICATION—Keep the cells in 40%-60% charged state during long period storage. We recommend to charge the battery every 3 months after receipt of the battery and maintain the voltage 3.7-4.0V. Store battery in cool and dry place.//SUITABLE for Bluetooth speaker dash cam keyboard and mouse Wi-Fi smart home systems PDA and digital cameras GPS e-books tracking devices blood oxygen tracking equipment pulse monitors wireless IoT.