czvv Rechargeable 9V Batteries Lithium - High-Capacity 850mAh Square Battery Li-ion 8.7V - 8 Pack with Ultra Fast Charger - 1300 Cycles - High-Performance, Long-Lasting for Smoke Detector, Radio

Higher Capacity, Lower SpendUpgraded 850mAh lithium cobalt oxide battery with about 2.6x larger capacity than common 9V 320mAh batteries. The eco-friendly concept runs through manufacturing. Say NO to harmful substances together such as Hg/Cd/Pd. Less than 1% - self-discharge rate of CZVV lithium batteries 9v ensures 85% capacity maintenance after 36 months of non-use. Longer 1300 service life. The Energy is About to Shift ,a wonderful combination of electricity and chemistry.

≤4H Strong Fast-ChargeSupport 4-channels of fast charging at the same time. Preset with 3 charging models - Trickle charging, Constant Current charging, and Constant voltage charging, 5V 2A input ensures batteries to 100%. LED lights on the charger allow you to check the charging status anytime. 6-in-1 IC chip with a leak-proof design, safety protection comes first, and hassle-free use. *Unauthorized use of other brand chargers may cause accidents.

Wide ApplicationsCompatible with most 9V battery-powered devices, like 9v battery smoke alarm, garage door openers, alarm clocks, wireless microphones, radios, electronic toys, flashlights, remote controls, massagers, transceivers, guitars, bass guitars, metal detectors, multi-function instruments, etc.

Why 8.7V instead of 9V? As we all know, the nominal voltage of lithium battery is 3.7V, and the full-charged voltage is 4.2V - better known as the charge cut-off voltage. By connecting two groups of 3.8V High-Energy-Density lithium-polymer cells in series, we fabricated K007 with an EnergyCLSave frame. Under ideal conditions, a fully charged 9V battery will maintain a high voltage of about 8.7V(4.35V*2) - the highest voltage among all brands' lithium 9v rechargeable battery can achieve so far.

What You Get CZVV Ultra 850mAh square battery 9v(8 Count Pack with Output DC 8.7V), CZVV Q019 Pro Individual Portable 4-Slot Charger(Input 5V 2.0A), Type-C Lightning Cable, User Guide, our worry-free 12-month warranty, and friendly customer service.