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EASY to charge and reuse. Our batteries have a built-in USB-C port and can be easily charged via laptop, charger, power bank, etc. An LED on the positive terminal indicates full capacity. They charge in 2 hours. SUPERCHARGE – With up to 800 charge cycles, you can use these batteries as many times as you want and more! With these batteries, your devices are always ready to go. Fully rechargeable in just an hour, say goodbye to waiting! They're ready to go. RELIABLE: Replace your disposable batteries. The reusability of these batteries surpasses any conventional battery in terms of price, sustainability, and performance. We promise our customers a constant voltage of approximately 1.5 V throughout their entire operating time. SAFE TO USE. The rechargeable cells are equipped with a safety circuit board that protects against overcharging, short circuiting, and deep discharge. The batteries cannot be charged using a charger, but only with a USB-C cable. FOUR BATTERIES, ONE CABLE – Less mess and more convenience with this 4-pack of batteries. The included 4-in-1 USB-AC cable lets you charge all the batteries at once. Ideal for everyday use. Use our batteries in your remote control, flashlight, controller, fairy lights, toys, kitchen appliances, wireless mouse, wireless keyboard, walkie-talkie, and more.