MiBoxer C8. Multi-bay Smart Battery Charger.
BUY the C8 with Amazon Prime; https://amzn.to/2W25P1F
Here's the MiBoxer C8 charger. It's an EIGHT-bay smart charger than can handle just about ANY circular rechargeable battery whether it be Lithium-ion, NiMH, NiCD, or LiFePO4.
The C8 works either automatically, or with settings you can set yourself. Useful pieces of information are given while each battery is being charged.
An example of acceptable battery sizes; 10340, 10500, 12650, 13450, 14500, 16340, 17500, 18350, 18650, 18700, 21700, 25500, 26650.