Probador de resistencia interna de capacidad de batería 18650/21700 descarga de carga automática

1 21700 BatteryHolder DC5V 3A. The product has no switch key, power on automatically turn on, power off shutdown. 1 18650 Battery Capacity Internal Resistance Tester. Supports separate charging and discharging, and supports up to 9 charging and discharging cycles in automatic mode.

eBay