Good day, I am attaching this screenshot showing an inconsistency in the calculation of battery consumption. 100%-17% consumption= 14 remaining. It should be 83 remaining, right? regards
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Hi and welcome to the community.
You can now also click on the three dots at the top right for more usage 
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But even with that, I hardly ever come to a 100% sum…
True it is never that accurate. I can count 20% out of 27%
Measuring how much power is used by each app when there are multiple apps running.
Power is a function of amps used per hour times the voltage.
Every time an app is very active the voltage drops a bit and then recovers, so the voltage may be out by some percent. The each app would have to be monitored for the current draw and I doubt each app does that so the OS may try to estimate to current drae by seeing how long it takes for the battery voltage to drop a specific amount.
All a bit variable and estimated again and again etc.
I would doubt the end result is within 10%
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I’ve noticed something similar but I’ve always just assumed it’s the Android system eating the rest. That makes no sense in your case though.
Is that response to the OP ?
I’ll try that ! thanks
Oh and you may want to scroll the screen to see if there are any other App or OS uses hidden from the immediate view
I use AccuBattery from the Play Store to monitor and give me info about my battery behaviour.
I admit I paid for the Pro version but it’s really helpful for keeping track of app consumption, charge/discharge rate.
It has a Health tab which you can use to monitor the general state of the battery over time.
The main feature I use it for is to give me an alarm when charging hits 80%. The app makes a big point about how charging from 20% to 80% only uses 0.2 of a charge, while charging from 80% to 100% uses 0.8 of a charge. A lithium battery has about 1000 charges (give or take) before significant degradation, but the degradation is also progressive. This app helps keep track of it.
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By the way for those wanting to read some detail views see the following, not that there’s any evidence to support the ideas.
The problem with 40-80 rule is that there is nothing like 100% charge a 0% state. It’s all about voltage, resistance and current drawn from the battery. So the 40-80 rule could be valid if the manufacturers set the 0% and 100% limits to the physically extreme limits (like 2.7 V for liion). However, if the manufacturers are at least a bit clever, they’d set the 0% level to something less physically extreme like 3.0 V. This would slightly decrease the announced capacity, but greatly extend the lifetime of the battery even if charged 0-100 every time.
Or is there any writeup about how Android calibrates for batteries?
The power chips that charge are on the core module and are made by Qualcomm . Similar re: your other note Fairphone and others exploit the inbuilt battery low safety switch to stop the phone discharging but it will disconnect the phone to do so. And equally 100% is not 100% of the battery it’s 100% of what the charging algorithm ‘allows’.
So the 40/80 is just a more cautious way of not stressing the battery and in that sense can prolong it’s viability.
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