【USB-C Rechargeable Lithium 9V Batteries】 This 9 volt battery has a high capacity of 9800mAh with a built-in USB charging port, which can be quickly charged with the included USB-C cable. You can use a 5V charger for the mobile phone charger, for example, to charge the battery. A built-in LED indicator light allows you to check the charging status - red light when charging, green light when fully charged. 【2000+ Times Cycle Excellent Performance】 The Bestely 9V rechargeable battery has a capacity of up to 9800mAh and can be charged more than 2000+ cycles. Easy to use, no memory effect, provide more power to your device. 【Safe & Eco-friendly】 9V lithium-ion battery has five-fold protection, intelligent control over the whole charging process, built-in protection against over-charging, over-voltage, over-current and over-charging, which can protect the battery well. 【Wide Compatibility】 9V lithium battery is suitable for smoke detector alarm, Fire Alarms, Thermometers, Garage Door Openers, Toys, GPS, Metal Detectors, Walkie-Talkies, Digital Cameras, Game Controllers, Toys, Watches, and Medical Equipment. High Concern Chemical: None, Rated Capacity: 9800mAh Voltage: 9v, Usage: for Smoke Detector, Alarm, Microphone Model Number: 9v 9800, Type: Li-Ion Brand Name: Rscrola, Origin: China