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External working power supply: 5V 1A (the power supply is self-provided, you can use the mobile phone charger). The charging mode (Charge) and automatic mode (AUTO-TEST) need to be connected to an external working power supply for normal use.Safety Tips: The load resistor will release a high temperature of 60~80 during discharge. Keep ventilation during use, avoid close to flammable and explosive materials, and notify you to pay attention to safety and avoid burns.Working mode (need to connect to 5V power supply)18650 battery, power bank capacity testerTest voltage: 5VDisplay mode: 128x64px LCDCapacity range: 99999mAhEnergy range: 99999mWhTiming range: 999:59:59Working battery: flat head 18650 batteryPower interface: Type-Ccolor: greenMaterial: PCB+plastic+electronic accessoriesAUTO-TEST automatic mode (boot default mode)Start -charge (charge current is less than 0.12A, trigger full charge, stop charging) -discharge (load voltage is less than 2.7V, trigger discharge complete) -charge (charge current less than 0.12A trigger full charge, stop charging) -complete stopThe capacity and energy values are not recorded during charging, only timing.Record the capacity and energy value when discharging, the same is timing.CHARGE (charging mode)Start -charge (the charging current is less than 0.12A to trigger full charge and stop charging) -complete stopOnly record the charging time, not the charging capacity and energyDISCHARGE (discharge mode)Start -discharge (load voltage is less than 2.7V, trigger discharge is completed -complete stop)Record the discharge capacity, energy and time.without 18650 batteryPackage Contents:2 x Battery Capacity TesterOnly the above package content, other products are not included.Note: Light shooting and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.