【Built in USB port enables easy charging】 You can plug the usb rechargeable batteries into any USB ports with no cords needed, such as laptop, power bank, wall charger or car charger. Fast charging time is 1.5 hours, and it have indicator lights that blink when charging and go solid when done 【Magnetic caps help prevent losing parts】 The cap pulls straight off, you can attach the magnetic caps to the body of the aa rechargeable batteries when charging 【Recharged at least 1200+ times】 Multiple charges barely lose capacity, in the long run they will save you money on battery purchases and also reduce your environmental impact throwing away disposables, comes with a small carrying case too 【1850 mWh provides longer battery life】 It lasts 1.4X longer than other aa batteries, the aa lithium batteries holds a steady 1.5 volt, in a game controller they work great, and don't worry about running out of power while you're playing, also works for blink camera, flashlight, TV remote, LED light, mouse, keyboard, etc. 【Advanced explosion-proof & leak-proof technology】 After a number of safety tests, the rechargeable aa batteries usb c is as safe as the built-in charger for cell phones and computers, and you don't have to worry about harming your expensive electronic devices. PS:The battery is not fully charged when it leaves the factory. Please fully charge it before use. PS:The battery is not fully charged when it leaves the factory. Please fully charge it before use. Need to buy batteries often and spend a lot of money on them? How do you dispose of dead batteries? How about to using CARDIENS to solve these problem? Here is the reason why you should choose CARDIENS! 1. Other aa batteries rechargeable comes with their own charger, and you need to buy an extra charger and keep it with you, but CARDIENS AA Batteries are easy to charge, just take off the cap and plug it into any USB port, no extra parts are needed. 2. With a handy magnetic hold on the endcaps so they don't get lost. 3. 1850 mWh lithium batteries aa rechargeable, and others is 1300, you can use the batteries for a long time. 4. The factory was established in 2006, And it has a complete set of product quality assurance system design and autonomous research and development capabilities. Don't worry about the usb aa battery's safety. 5. The lithium ion aa batteries can be recharged 1200+ times, the usb batteries aa size pack will still save you tons of money and time. It also reduce the dead batteries that get tossed into landfills. 6. Indicator status: The green indicator blinks when charging, and the green indicator keeps on after charging is complete. Product information: Operating Voltage: 1.5V Battery Energy: 1850 mWh Charging Voltage: 5V Standard Charging Time: 120 mins Fast Charging Time: 90 mins Cycle Life: 1200+ Operating Temperature: -20-40℃