USB Rechargeable 9V Lithium Batteries 4 Pack, 4100mWh Long Lasting 9 Volt Size Batteries, High Capacity Li-ion Battery, for Smoke Alarms, Wireless Microphones, Guitar, Toys

【9V Constant Voltage】The insziii lithium-ion battery has a capacity of up to 4100mWh with a constant 9V voltage providing stable power and longer operating time for devices used at high frequencies, such as smoke detector, wireless microphones, toys, flashlights, home security devices, medical devices, etc.
【USB-C Charge Design】These 9V lithium batteries are easily charged with a 4-in-1 USB-C cable, eliminating the need for a charger and adapter, and can be fully charged in approximately 2.5 hours. Built-in LED shows the charging process, with a red light indicating charging and a green light indicating full charge.
【Over 600 Cycles】The rechargeable 9V lithium-ion battery has 600 cycles, no memory effect, can be charged at any time, will help you save big money and save time compared with single-use batteries, which are very convenient and reliable.
【Multiple Safety Protection】Built-in integrated safety circuit to ensure safe operation. When the battery is fully charged, it will automatically stop charging, effectively preventing overcharging, overcurrent, overvoltage, overheating, and short circuit.
【Energy-Saving Battery】Loving the environment starts with rechargeable Li-ion 9V batteries, which save thousands of alkaline batteries and reduce landfill waste.

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