I was curious about this. For some home smart locks, they have a kind of nose ring on the bottom where you can hold a 9V battery against it, and use that to power the entry system (which only needs you to enter a code) until you can change the inner battery.
Well then I just go to my friend nearby who has the spare key. Rarely happens that I have a completely empty phone battery. And I can just charge it in my car if necessary.
And then that priceless moment when the battery dies.
I was curious about this. For some home smart locks, they have a kind of nose ring on the bottom where you can hold a 9V battery against it, and use that to power the entry system (which only needs you to enter a code) until you can change the inner battery.
Well then I just go to my friend nearby who has the spare key. Rarely happens that I have a completely empty phone battery. And I can just charge it in my car if necessary.