The Energenie BC-USB-02 is a versatile black battery charger designed to handle a wide variety of power cells. It supports Ni-MH, Ni-CD, and Li-Ion chemistries across numerous sizes, ranging from standard AA and AAA to specialized cells like the 18650 and 17670. You can monitor the progress of each of the four slots via four-stage LED indicators, while built-in safety systems protect your devices from short circuits, overcharging, overheating, and polarity reversal. For batteries that have dropped to zero voltage, the integrated recovery function helps reactivate them for further use. Beyond charging, this device can function as a power bank with a 5V/2A USB output, provided you have 3.7V Li-ion batteries inserted. It is powered via a standard 5V USB input, making it compatible with various quick chargers. Weighing 142 g and measuring 110 x 105 x 39 mm, it is compact enough for travel and comes with a USB cable featuring USB-A, Micro-USB, and USB-C connectors to ensure you can plug it in almost anywhere.