Note：The battery can only be charged by type-C cable. Other chargers cannot be charged, please note! Modelo: AAA Nominal capacity: 550mWh Rated voltage: 1.5v Rechargeable battery: Yes series: USB rechargeable battery Rechargeable times: more than 1200 times
What we have here is a very unique product. These are 450mAh 1.5V AAA Li-Ion batteries which charge via USB Type-C port built right into the battery!

The composition inside the batteries is Lithium-Ion which has a higher capacity than Ni-Mh AAA batteries and can stay at a constant 1.5V not 1.2V of most rechargeable Ni-Mh batteries. 

Li-Ion also has the added benefit of higher capacity. These batteries are rated at 450mAh at 1.5v with much quicker charging times (fully charged in 2 hours).

The technology inside each battery is also nothing short of amazing as each one is equipped with it's own tiny charge control circuit right under the cap. There is also a plethora of protection circuitry built right into the batteries themselves. 

PLEASE NOTE: These batteries MUST be charged using a standard 5v USB Type-C cable and WILL NOT charge via a Ni-Mh / Ni-Cd AA charger. 

Just use any standard 5v USB-C charger to charge the battery. The LED on the battery will indicate if it's charging (flashing red) or fully charged (constant red).