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Features: 1Built-in PCB protection board 2brc 18650 battery pack li-on battery Provides excellent continuous power sources to your device 3Easy to carry, best fit for travel, holds 85% charge over 12month period 4This battery has an extra long life for all your battery powered devices. 5High energy density, long life span,High quality and durable 6Provides excellent continuous power sources to your device Battery Specifications: 1.Battery Type:18650 battery 2.Voltage: 3.7v 3.Material: Li-ion Battery 4.Rechargeable Times: about 500~700 5.Dimensions: 6.8 cm x 1.8 cm x 1.8 cm 6.Weight:0.45g Charger Specifications: 1.High Quality 2 Slots Charger for 18650 Battery 2.The charger provide output shortage protection when battery is fully charged 3. It is with high efficiency and reliability! 4. Can charge battery quickly and safely 5. Output : 4.2V-600mAH 6. Input : AC100-240V, 50/60Hz 7.Charge complete within 7-8hrs 8.Plug: US 9.Compatible with 18650 batteries Package includes: 4x 5000mah18650 Battery 3.7v 1x 18650 battery charger Warming Tips: 1.Don't not insert batteries with (+)and (-) reversed 2.Do not disassemble ,dispose in fire ,heat or shot circuit 3.Don not submerge the Battery in water . Our products have been well tested, examined and packaged before sending off. Any problem please feel free to contact us first so that we can supply the best service for you.