The Slim K4 Efest charger is a charger for 4 Li-Ion, IMR, INR and ICR batteries which allows charging at 0.5A for 4 or 3 batteries, 1A for 2 batteries and 2A only for one battery.
It is connected using a USB type-C cable. It has visual indicators above each battery to easily understand the state of charge of the batteries.
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