Standalone battery charge timing + alarm. Uses a minimum takeoff target (e.g., “Minimum takeoff % to land with 30%”) + optional buffer, or your override target.
Inputs
Paste the minimum takeoff % you want to hit (commonly the “land with 30%” minimum from the estimator).
Added on top of the minimum target (default +3%).
This is what you see on the battery at the reading time.
If older, we estimate current % using your charge rate.
Tip: use Calibration once and it will remember.
Leave blank to use computed target. Enter a number to override.
Example: 2 = alert 2 minutes before the battery should be ready.
0 = single alarm.
Defines the yellow “almost ready” band as (target − tolerance) → target. Example: 3%.
Desktop notifications
Optional fallback if audio is muted.
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Calibration
Enter start/end % and minutes to compute %/min.
Plan
Estimated time to charge
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Ready window
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Quick facts
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⚠️ Battery Alert
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Keep this tab open for reliable alerts. If the computer sleeps, alarms may be delayed. Some browsers require at least one click on the page before audio can play.