Disclaimer: I am far from being an electrical engineer, I'm only a DIY enthusiast trying to stay safe.
I'm building a collection of sensors using little ESP-01 chips, but having them running free on batteries would allow far better projects. I'm thinking of Li-ion (cylindrical or pouch) 3.7V batteries, old or new.
There are many warnings here and there about potential hazards, but I could not find any comprehensive resources about how to use them safely. Moreover, most resources don't differentiate batteries for scooters and for microchips so I don't know what security rule applies.
For instance, I often hear about a "protection circuit" for overcharge or over-discharge, but:
- How to know which circuit should be used with which battery?
- In the case of a scraped battery (in my case an old Blackberry 3.7v 1270mAh Li-ion), how to (safely) know if a protection circuit is already in place?
PS: I'm not discussing what I will need to keep my sensor running for long, that will be for later.