I am fuel gauging a 3200mAhr pack and discharging at a 50mA rate as a test. The remaining capacity and time is adjusted slightly several times until we get to the voltage drop off knee: The remaining capacity is suddenly adjusted downwards in the last 15 minutes. This is a problem (medical applications) when expecting say10 mins but end up with 2 and being informed at the last moment. Any ideas what could be happening and what to adjust please?
It happens when the battery is left for a while ( say +2 days) before commencing discharge. I'm guessing its something to do with quiescent discharge but that should have been captured by the fuel guage.