You really wont be able to measure the voltage over time on a 0-100% basis similar to your iphone if this is what you are looking to do. The drain of lipo batteries is non-linear and requires a separate circuit usually called a fuel gauge to read its drain output like such. The closest you'll be abl...

I don't fully understand your questions but I can share some info that maybe can help (some of this you may know): 1. If you're using a lipo battery you should use a protection circuit and not rely on the code to shut it off once it is discharged/overcharged past a certain level. 2. Using a voltage ...