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【Superior Capacity of 1350mAh & Stable Output】Equipped with premium Class A Li-ion cells, our 9V rechargeable batteries offer a higher capacity of 1350mAh and a stable output of 9 volts until complete exhaustion. They exceed standard 600mAh Ni-MH batteries by 125%, ensuring a longer run time for high-consumption devices such as smoke detectors, guitar pedals and professional microphones, without sudden power drops. 【USB-C Quick Charge in 3.5 Hours and LED Indicator】Hello to bulky chargers! Each battery comes with a built-in USB-C port for maximum comfort. Charge it from any USB port - laptop, power bank or wall charger - in just 3.5 hours. The intelligent LED indicator (flashes red when charging, green steady when fully charged) eliminates any doubt and ensures the safety of charging. 【Over 1000 charging cycles and ecological savings】Designed for sustainability, each battery offers over 1000 reliable charging cycles. This pack of 4 replaces more than 1,200 disposable alkaline batteries, saving hundreds of dollars in the long term and significantly reducing environmental waste. It is the smart, economical and environmentally friendly choice for your home and business. 【Ultimate 8-Layer Safety Protection】Your safety is our priority. Our batteries are equipped with advanced 8-layer protection against over-charging, over-discharge, short circuit, over-current and overheating. Strictly tested for reliable performance under extreme conditions (-20°C to 60°C), they provide absolute peace of mind when used in crucial safety devices such as smoke detectors and CO alarms. 【Wide Compatibility】Perfectly compatible with 99% of 9V devices, including smoke/fire detectors, wireless microphones, toys, medical equipment and digital scales. The standard size 6F22 ensures a perfect fit. Constant voltage of 9V: The AKTTKA 9V battery is a constant voltage design and continuously provides 9V power during use, ensuring the stable operation of the appliance and improving the use experience.Note: When the battery runs out, the appliance will stop immediately. This is a normal phenomenon, not a battery defect, just replace it with a new one to restore the normal operation of the device.