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Smooth battery time remaining estimate (#2854)

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* feat(battery): smooth time remaining estimate with moving average

* feat(battery): use a time-weighted EMA for time remaining estimate

port 1.5
This commit is contained in:
Callum Wong
2026-07-15 01:32:48 +10:00
committed by GitHub
parent 52740290b2
commit bba5502960
1 changed files with 38 additions and 2 deletions
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quickshell/Services/BatteryService.qml
+38 -2
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@@ -182,6 +182,10 @@ Singleton {
}
onIsChargingChanged: {
// Reset average when switching states
_smoothedChangeRate = (_hasKnownChargingState && changeRate > 0) ? changeRate : 0;
_lastRateSampleTime = _smoothedChangeRate > 0 ? Date.now() : 0;
if (isCharging) {
_hasNotifiedLowBattery = false;
_hasNotifiedCriticalBattery = false;
@@ -233,6 +237,38 @@ Singleton {
return val;
}
// A time-weighted exponential moving average based on the aggregated charge/discharge rate
property real _smoothedChangeRate: 0
property real _lastRateSampleTime: 0
readonly property real _rateSmoothingHalfLife: 90 // in seconds
function _updateSmoothedRate() {
if (!_hasKnownChargingState || changeRate <= 0)
return;
const now = Date.now();
if (_smoothedChangeRate <= 0 || _lastRateSampleTime <= 0) {
_smoothedChangeRate = changeRate;
_lastRateSampleTime = now;
return;
}
const dt = (now - _lastRateSampleTime) / 1000;
_lastRateSampleTime = now;
if (dt <= 0)
return;
const tau = _rateSmoothingHalfLife / Math.LN2;
const alpha = 1 - Math.exp(-dt / tau);
_smoothedChangeRate += alpha * (changeRate - _smoothedChangeRate);
}
onChangeRateChanged: _updateSmoothedRate()
onBatteryAvailableChanged: if (!batteryAvailable) {
_smoothedChangeRate = 0;
_lastRateSampleTime = 0;
}
// Aggregated battery health
readonly property string batteryHealth: {
if (!batteryAvailable)
@@ -341,8 +377,8 @@ Singleton {
return "Unknown";
}
let totalTime = 0;
totalTime = (isCharging) ? ((batteryCapacity - batteryEnergy) / changeRate) : (batteryEnergy / changeRate);
const rate = _smoothedChangeRate > 0 ? _smoothedChangeRate : changeRate;
const totalTime = (isCharging) ? ((batteryCapacity - batteryEnergy) / rate) : (batteryEnergy / rate);
const avgTime = Math.abs(totalTime * 3600);
if (!avgTime || avgTime <= 0 || avgTime > 86400)
return "Unknown";