Until when
The time your battery reaches the reserve, with an honest range from cautious to optimistic. Never a fake exact number.
Windows 10 and 11 · x64 and ARM64 →
Battery Forecast
How long will your laptop really last today? An AI forecast that learns how you use your PC, and runs entirely on it.
Free · MIT-licensed project code · No account · Works offline
Demo interface: synthetic history, with forecasts computed by the real local model.
Made for your day
Answers, not percentages.
Windows tells you a percentage. Battery Forecast tells you what it means for the rest of your day.
Your evening
How much will be left at 22:00, or any time you choose. And a gentle hint to turn on battery saver if it won't last.
Calm alerts
About 60, 30 and 15 minutes before the reserve, at low battery, when charged, or when something drains unusually fast. Once each.
There when you need it
A glance.
Then back to work.
Your battery forecast lives beside the clock. Reach it without leaving what you’re doing.
- 01Rest your pointer.
Hover over the battery icon to bring up the forecast.
- 02See what’s ahead.
Read your remaining time, evening level and the 24-hour curve.
- 03Carry on.
Move away to close it, or click to keep it open. Your keyboard shortcut works too.
Open from the notification area
On battery and on the charger
Two forecasts.
One panel.
The same local AI reads your battery history and answers the question that fits the moment: how long you will last, or when you will be charged.
Demo mode: synthetic history; the forecasts are computed by the real local model.
How it works
It learns your habits.
Then it looks ahead.
Every minute Battery Forecast records your battery level. A time-series AI model, Timestral by Mistral AI, reads weeks of that history and forecasts the next 24 hours.
- One clear scenario at a time. On battery: how long if you keep going as you usually do, without plugging in. While charging: when you reach your target if you stay plugged in.
- Habits and the present, side by side. The forecast from your habits always comes with the estimate at your current rate, and with Windows' own.
- Honest about the unknown. When you usually plug in, the model can't know what you'd use on battery; the chart says so and continues at the expected rate, dashed.
- Health and history. Full-charge vs design capacity, and the discharges it has observed, without inventing cycles.
Light on your battery
The AI sleeps
until it's needed.
The model is not a background service. It starts to compute, answers, and closes. With battery saver on it never starts by itself.
30 minat most, between background forecasts on battery (you can choose)
~3 sof CPU per forecast, measured on the development laptop
0engine processes left running a minute after a forecast
Passivewaiting between forecasts: idle engine threads do not spin
Four themes
At home next to the clock.
Dawn and Mist for light days, Dusk and Midnight for the evening, or simply follow Windows. Italian and English.
Your schedule, your machine
More than a battery percentage.
Choose your times, inspect the curve and see the system context behind the estimate.
Explore any hour
Hover over the chart to move its dot and read the date, time, expected percentage and indicative range. Keyboard arrows work too.
Your own targets
Type any HH:mm target and up to four extra times. Open and close the panel with a shortcut you record (initially Ctrl+Alt+B), or just rest the pointer on the icon. Make the panel as large as you like.
Charging, too
Choose a charging target from 50–100%. While charging, the same AI learns from your past charges and tells you when you will reach it, slowdown near full included, next to the current charging rate. It does not control the hardware. When a charge limit holds the battery, it shows how long it would last if you unplugged now.
Useful local context
Optionally record CPU load and frequency, memory, battery watts, brightness, power profile and available temperatures. Timestral receives usable historical channels; future values are not invented.
Make it yours
Custom alert thresholds, quiet hours, chart visibility and a keep-open preference. Copy a summary or export battery and sensor CSV files.
Diagnostics you control
Create a local diagnostic ZIP without battery history or logs. Nothing is uploaded automatically. Missing sensors stay unavailable; an ACPI thermal zone is not labelled CPU temperature.
- Says why the charge stops. Plugged in at 80% and not charging? A short line explains that a charge limit is probably protecting the battery.
- Open it your way. Rest the pointer on the icon, click it, or press your shortcut again to close.
- Tidy preferences. Six sections with icons: forecast, panel and shortcut, notifications, appearance, data and privacy, general.
Charging and sensor context are experimental. Functional tests use the real local model; accuracy gains have not been established.
Private by design
Your battery data
never leaves your PC.
Python, PyTorch and the model ship inside the installer. Forecasts work with the network off.
- No account, no telemetry. History lives in a local database you can export as CSV or delete at any time.
- One optional network call. Once a day the app asks GitHub if there is a new version. You can turn it off.
- Verified updates. Installers are downloaded only from GitHub and checked against the SHA-256 published with each release.
Download
Get Battery Forecast.
One installer per architecture, for your user only: no administrator rights needed.
Windows 10 (2004) or 11 · Intel/AMD x64 or ARM64 · about 280 MB download
Windows security: the installers are not digitally signed yet, so SmartScreen may warn you.
Choose More info → Run anyway, or first compare the file with its
.sha256 from the release page:
Get-FileHash .\BatteryForecast-Setup-*.exe
Is the forecast exact?
No forecast of the future can be. Battery Forecast shows a central estimate with a range, says which model produced it, and tells you when it is still learning. Accuracy on real laptops has not yet been measured.
Why is the download that large?
It includes everything needed to run the AI offline: a private Python runtime, PyTorch for CPU and the Timestral weights. Nothing else is downloaded later.
Does it change my power settings?
No. It reads available battery and hardware signals locally. When battery saver would help, it opens the Windows settings page for you.