What kind of USB charger should I use?

For MJ-6112, MJ-6116 and MJ-6116C

These batteries can be charged via Magicshine MJ-6072 wall charger as well as most mainstream USB charging bricks via Micro USB, protocal for these battery units is 5V/2A. The two available ports are USB-A(for powering other devices) and Micro-USB(for charging the battery itself).

For MJ-6118 (7.2V 10Ah)

Compatible with Magicshine MJ-6072 wall charger as well as most mainstream USB chargers via USB Type-C, protocal for this unit are 5V/3A, 9V/2A and 12V/1.5A. Only one available USB Type-C port for input and output.

We recommend an 18W charger for MJ-6118 to minimize charging time.