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Firstly and from the picture supplied - attach the charger to the computer.
As per picture, one is attempting to Reinstall the Operating System while running on Battery.
Doing so increases the high probability the battery will run out of power before the Reinstallation is completed.
It look like this method is being used >> How to reinstall macOS. This will Require a functioning Internet Connection. For best results use an Ethernet Abel to Router. In so going, this will eliminate the Manually Inputing the Wifi Password when this process was first started.