The Efest K Series chargers are available in single bay (K1) dual bay (K2) and quad bay (K4) all are lightweight and super easy to use. The K1 and K2 is powered by Micro USB with capabilit's to charge at 1amp on each bay, whereas the K4 Charger is powered via a USB-C and has a maximum of 2amp charging over all bays combined.

The K series chargers are compatible with multiple Cell sizes from 10440 to 26650 and has multiple protections built in to ensure a safe and easy charging, inserting the cells couldnt be easier, a simple spring loaded clip that adjust to the length of the battery.

Although Efest have included multple safety protections into the K series chargers, it is not recommended to leave any cells on charge un-attended.