efest slim k1 charger

It only holds one battery

Compatible with: 10440, 14500, 14650, 16340, 16650, 17650, 17670, 18350, 18490, 18500, 18650, 20700, 26500, 26650

Portable Design with Quality Piano Strings - 15,000+ Tensile Test

Features over-current, over-voltage, short-circuit, and reverse polarity protection

Battery Life LED Indicator Light

Dual Slot 5V/1A Micro USB Charger Each Slot monitors independently