Save your lithium cells.

Lightweight macOS monitor that alerts you when to plug in or out. Optimized for the 20-80% charge cycle.

Download .DMG Universal Install via Brew Gatekeeper Guide

The 20-80 Window

Lithium-ion batteries hate extremes. Staying between 20% and 80% charge significantly reduces stress on the cells, extending your MacBook's battery life by years.

BatAlert sits silently in your menu bar and plays a sound notification the moment your battery hits your defined threshold. No bloat, no background daemons.

Optimal Range 20% - 80%
Degradation zone Safe zone Degradation zone

Trusting the Binary

Because BatAlert is open-source and not signed with an Apple Developer certificate, macOS Gatekeeper will initially block its execution. Here is how to manually approve it.

Step 1

Step 01

When opening for the first time, macOS will show a security alert. Click "Cancel".

Step 2

Step 02

Go to System Settings > Privacy & Security.

Step 3

Step 03

Scroll down to find the section about "BatAlert" and click "Open Anyway".

Step 4

Step 04

Confirm by entering your password or using TouchID if prompted.

Step 5

Step 05

One last confirmation: click "Open" in the final dialog.

Step 6

Step 06

BatAlert is now active in your menu bar. Setup will start automatically.

System Features

01 / Logic

Zero Bloat

Pure Python script packaged as a native .app bundle. No background daemons or massive frameworks.

02 / Alerts

Custom Sounds

Choose from system sounds or use your own custom .aiff, .mp3 or .wav files for notifications.

03 / Interface

CLI First

Configure everything from your terminal. Lightweight, keyboard-centric, and automated.

Settings in the Menu Bar

Adjust everything from the BatAlert menu bar icon. No Terminal, no config file to edit.

01 / Threshold

Alert Level

Set the charge level that triggers the alert.

02 / Interval

Check Interval

Choose how often the battery is checked.

03 / Sound

Sound Preview

Pick a sound and hear it before you save.

04 / Language

Language

Switch the interface language on the fly.

05 / Startup

Launch at Login

Start BatAlert automatically when you log in.

Installation

Method A / Package Manager

# Add tap repository
brew tap elkwaet/batalert https://github.com/elkwaet/homebrew-batalert.git

# Install app and CLI
brew install --cask batalert
brew install batalert-cli

Method B / Direct Bundle

Universal DMG

Standalone installer compatible with Intel and Apple Silicon (M1/M2/M3/M4) processors.

Download Latest .DMG

Manual installation scripts and development guides are available in the Project Wiki.