Well, I’ve posted this same thing in the Spanish Forum, but I’m in a bit of hurry and no one has answered me yett, so I’ve decided coming to the original souce of knowledge = English internet posts.
The thing is that I’m working on a project that would control a lock for my door on an IR signal, and this circuit would be continuously connected to my house’s electrical supply. But, preventing some electricity cuts whenever there’s some storm, I’ve decided to make a backup battery for being able to open the door and not be locked in or out of my room.
After searching a lot, I’ve encountered a couple people mentioning that charging Li-ion batteries while using them is possible, so this is my question:
Could I have about three Li-ion batteries serial-connected and charge them while inputing power to my circuit, son if there’s a failure with electricity my circuit will be still working with the power remaining on the batteries themselves?
I’m attaching a paint drawing of what I mean, just in case I didn’t get to explain myself.
Excuse if either my English or my knowledge about electricity are awful… I’m here trying to improve both of them