I have just got a curly question from a client, and looking to the brain trust for an answer.
Can you tell the % of a battery just through how much current resistance/flow it's drawing from a charger?
Use case: I plug my phone into a charger that is designed to measure how much current the battery is drawing and how much resistance there is to pushing more juice in. Can I theoretically know how full the battery is by external measures without installing and app or knowing the mAh size of the battery.
My initial thought was yes, much like how a trickle charger knows when the battery is full. But the client challenged me and asked what if the phone hardware isn't giving you direct access to the battery, or genuine feedback from the battery.
Any help is appreciated, the more I thin about it the less certain I get.
p.s. This isn't my first post, but it is a new account so just seems that way