It's brilliant in its simplicity. I'd never think of that. I'd try to overengineer something out of the environment, but with less skill than MacGyver.
I would just pull out the longer cable from my backpack. Or use the power bank I have in my backpack. Or use the power bank as a pass-through to use both the cables. Or accept the fate and shutdown my primary phone partially* or completely.
*Partial shutdown means disabling certain services and features to save power without fully shutting down everything. This does usually not mean using a battery saver. I use MIUI, it is already fairly unpredictable and regular battery saver** only makes this situation worse.
**There's also ultra battery saver which kills everything deemed unnecessary running in the background. That couldn't be more predictable.
Seems like crossposting is an effective way to seed a community, because the crosspost got about 120 upvotes, and the subscriber count is now up to 60.
UK plug is best in the world. Has three prongs so earth is always there. Also it pushes the protectors out if the way to open up the live socket so nothing can be incorrectly put in there. It's solid and won't fall out, you could hang a child off of that. Every plug has a fuse to protects the house and helps prevent fires. Live and neutral are partially covered in plastic so nothing can touch it when it is half in and the circuit is live.
EU plug is way sturdier that the shitty American's plug. American plug looks like it is designed to fall out the EU plug stays in.
The aus plug is with weakest of the three because it is so similar to the american but at least it is tilted in a logical manner to stop a fucking plug falling out of the wall.
All three are based on a decent electrical supply so electrical items actually work