As much as I would prefer using LiPo’s this little project will have no way of charging the batteries, they will be in an isolated enviroment and suffer from all sorts of temperature issues.
Dry cells seem to be the only stable way to resolve a few of the battry headaches but I also need to maintain low power draw.
What I am looking at is using 3 X AA cells giving me 4.5V in total.
If i attach them to VIN then if the battery is not present on the battery connector the charge LED will stay on, I also want to be able to use the battery voltage sense circut to gen an idea as to what the battery level is.
I was thinking about cutting the track from the charge circut to the battery connector as an option but not sure as yet if this will cause other issues like stopping the vext from working.