4PCS USB Rechargeable Batteries double AA.

USB rechargeable batteries, also known as USB batteries or rechargeable lithium-ion batteries, are batteries that can be charged using a USB cable. Unlike traditional rechargeable batteries that require a separate charger, USB rechargeable batteries can be directly connected to a USB port or any USB-compatible device, such as a computer, power bank, or wall adapter.

These batteries are designed to provide convenience and ease of use. They typically come with a built-in USB port that eliminates the need for a dedicated charger. This feature allows you to charge the batteries on-the-go, without the need for additional equipment.

USB rechargeable batteries are often used in portable electronic devices such as cameras, flashlights, wireless keyboards, mouse, game controllers, and a variety of other consumer electronics. They are also available in different sizes and capacities to fit various devices.

One of the benefits of USB rechargeable batteries is that they can save money over time, as they can be recharged multiple times instead of being discarded after each use like disposable batteries. Additionally, they are more environmentally friendly, as they reduce the number of single-use batteries that end up in landfills.

To charge USB rechargeable batteries, simply connect them to a USB port or USB-compatible device using a USB cable. Usually, a LED indicator on the battery will light up to indicate that it is charging. The charging time may vary depending on the battery capacity and the power source.