Features: We provide all kinds of batteries ，welcome contact to us !1. SpecificationsType / Brand Lithium ion battery.Rated Capacity :680mAhNominal voltage: 7.4v -8.4 V (Full voltage 8.4V)Weight: 28gDimensions: (H x L x W): 48.5mm x 25.5mm x 17.5mmBattery performance:1: No memory effect2: Reliable service life3: Long-Lasting Performance4: Low Self Discharge5: High Discharge Rate6: Recharges up to 1500 Cycles7: Saves you hundreds of dollars compared to Alkaline batteries8: Can be replaced in any product that uses 9 Volt Batteries9: Battery tested based on International Electronic Commission (IEC) standard to ensure capacity， quality and life time Easily Power Common Applications Such As: 1: Microphones2: Remote Controls3: Power-hungry Equipment4: Building alarms， monitoring and security systems5: Industrial and residential metering systems6:Emergency location transmitters and Beacons7:Global Positioning Systems (GPS)Note: These Batteries come pre-charged， and can maintain 85% of their charge even after a year in storage or standby.100% brand new with 100% QC of every batteryPackage Includes4x Doublepow 9V 680mAh usb Rechargeable li-ion Batteries