iPhone Battery Diagnostics Tester Charger for iPhone 4 to iPhone X

This clever tool will allow you to test iPhone batteries for wear and usage, as well as charging/discharging them. Using any standard micro USB charger to power this device, batteries can be charged before fitting to ensure the phone is ready to use once the battery is inside the phone.

When a battery is connected, its output voltage will show on the left display, and cycle count on the right display.

To charge, press the charge button once, the LED will light up and the right display will now show current going in to the battery (to stop charging press either button).

To discharge the battery, press the discharge button once, the LED will light up and the right display will now show current being drawn from the battery (to stop discharging press either button).

Also, by double pressing the discharge button, you are able to view the battery efficiency on the right display and capacity (mAh) on the left display.