If you look at a typical Li-Ion discharge curve then 4.2v down to 3.7V is pretty much the useful life of the battery (90%). Looks OK to me so why complicate things?You are proposing basically using a voltmeter to estimate the capacity of LiOn battery. Since the discharge curve of a LiOn is basically flat, this is a very poor indicator of state of charge...
Gadgets that use LiOn have a microcontroller on board that actually integrates ∫i(dt) to report remaining charge. Save your time, or do it right.
So if you want to do it right, what would you do?Save your time, or do it right.
by Jeff Child
by Duane Benson
by Aaron Carman
by Aaron Carman