4-bay charger with USB-C input power for charging various lithium ion and nickel metal hydride batteries. The two side channels CH1 and CH4 can install 26650s. And the longgest battery can be unprotected 21700s. It also support Li-ion and NiMH batteries to be mixed charging. When the batteries are fully charged, the MC4S charger will intelligently stop charging. The seven safety protection functions in the MC4S ensure safe use.