Hello nest doorbell bricked, green circle en flashing led once

[Hairyfriend]

This is what my Nest Hello does: https://www.youtube.com/watch?v=8u0hjTBg25I

I replaced the internal battery for a new one but it won't boot up.

impossible to charge internal battery what also is suggested.

Any help please?

[EmptyNester]

Congrats for taking on the battery replacement project.   About 4 years ago my Nest Hello failed and I considered doing this.   But instead I ended up buying a used HELLO from someone on ebay for $130 and it has been going strong ever since.

I seem to remember when I installed mine years ago I charged it with a USB adapter before installing it.  If you look at the back you will see a small micro-usb port.  Maybe if you plugged in a cable there with a USB adapter for a few hours it would charge the battery?

Here is video of someone doing it.

https://www.youtube.com/shorts/o2yHeyXbxDk

I'd be curious to know if this works.    Good luck