9V Battery: A 1200mAh long life battery with no memory effect, which provides a stable voltage until the entire cell is used up. Up to 2000 recharge cycles: these USB batteries have longer battery life than disposable alkaline batteries, making them economical and cost saving. 1.5 hours fast charging: advanced iQuick charging technology with DC 5V/1A USB input. The battery is fully charged in 1.5 hours, which saves time and makes it more efficient. Unique USB Charging DesignConvenient as you can charge anywhere directly with the included 2-in-1 micro USB cable. No additional charger is required. You can check the charging status with the built-in LED light. HIGH PERFORMANCE: With a capacity of 1200mAh, the CITYORK battery supports stable power supply and long working time of frequently used devices such as smoke/fire alarms, wireless microphones, toys, GPS, home security devices and medical devices.