I wrote a battery meter (BatteryBar) 8 years ago that uses a more complex algorithm to calculate an "average time remaining" rather than instantaneous. Basically, my software keeps track of how long the battery has lasted in the past and uses that to inform the current time remaining (with adjustments based on current discharge rates, etc).
I'm not sure why Microsoft/Apple haven't done something similar. I've even sold licenses to Surface Pro sales reps that they use to show off the battery life of the Surface to potential enterprise clients.
I'm not sure why Microsoft/Apple haven't done something similar. I've even sold licenses to Surface Pro sales reps that they use to show off the battery life of the Surface to potential enterprise clients.