Is there a method (voltage, resistance, other...) of measuring leftover charge in a non rechargeable lithium battery?
I'm trying to get a general overview of power consumption for few battery powered devices which have been running in different conditions for a few days. The devices have a battery level percentage indicator but I don't know how its implemented and would like to do a side measurement.
There are suggestions to measure the state of charge by checking the voltage level of the battery. The problem there are no characteristics for the low power my device is using (5 miliampSeconds every 5-10 minutes).