I am currently in search for a battery charging ic that has a variable output voltage (so that I can set it to 3.6V to 3.9V) or a fixed range, similar to what I would like to have.
But why would I want that? Its because most of the charger ics are charging the batteries up to 4.2 which is considered 100% of charge.
This will use every bit, the battery has to offer, but will also damage it in the long run, so I would like to maintain my level of charge between 20 and 80% which is 3.6-3.9V According to this image: From here
I have a hard time finding a suited chip, any advice is greatly appreciated!