What do I do if Phone (2) is unresponsive when charging?

Please try the following:

1. Charge your phone using the original charger: please use the Nothing original data cable and charger to charge your phone.

2. Charge your phone via the USB interface: connect your phone to a computer or another device through the data cable. When the connection method dialog box pops up, click Only Charge.

Learn what the battery and charging icons mean.
You can tell the current battery status from the battery icon on the phone's status bar and the lightning bolt icon next to the battery.

After the battery percentage is turned on, the battery icon will display the battery value. You can turn the icon on by going to Settings > Battery> Battery Percentage.