Mac maintenance
The Mac Apps Most Likely to Be Draining Your Battery
The exact apps that quietly destroy MacBook battery life, with diagnosis steps and fixes. Real wattage numbers from Activity Monitor.
A MacBook Air M2 should give you 14-16 hours on a charge for normal work. If you’re getting 5, the problem isn’t the battery — it’s an app. Apple silicon Macs are aggressive about throttling background work, but when an app misbehaves it can pull 8 watts of sustained load while the lid is closed. Here are the usual suspects, how to spot them, and how to fix them.
How to actually see what’s burning your battery
Two tools do most of the work:
Activity Monitor, Energy tab. Sort by “12 hr Power” — the average wattage over the last 12 hours. Anything above 1.0 with the lid closed is a problem. Anything above 5.0 is broken.
pmset -g log | grep -i "wake reason" in Terminal. Shows what’s been waking your Mac. If you see Bluetooth, EHC1, or USB waking constantly, you have a peripheral or driver issue.
The Apple menu also shows “Battery health” via System Settings, Battery. If it says “Service Recommended,” your battery degradation is the problem, not an app.
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Google Chrome
Typical drain: 3-7 watts sustained, more with video tabs.
Chrome’s renderer process is a known battery vampire. A single autoplay video tab can pull 6 watts. Background tabs running JavaScript timers (Google Docs, Notion, Slack web, Trello) keep the CPU active even when Chrome isn’t focused.
Fix: Switch to Safari for routine browsing. If you must use Chrome, install the Tab Suspender extension and make sure hardware acceleration is enabled (Settings, System, Use hardware acceleration). Quit Chrome — don’t just close windows — when you’re done.
Slack
Typical drain: 1-3 watts idle.
Each connected workspace maintains a websocket, plus periodic polling for presence and notifications. Five workspaces is five websockets. The Electron framework underneath isn’t optimized for energy efficiency.
Fix: Close workspaces you don’t need open. Quit Slack when you’re heads-down working. Use the Mac client over the web client (it’s marginally more efficient).
Microsoft Teams
Typical drain: 4-8 watts during calls, 1-2 watts idle.
Teams is consistently the heaviest of the major chat apps. The new Teams 2.0 client is better than the original Electron version but still significant.
Fix: In Teams settings, turn off animations and the “Register Teams as the chat app for Office” option. Quit Teams when you’re not in a meeting.
Spotify
Typical drain: 2-4 watts while playing.
Most of this is the audio output itself, which is unavoidable. The hidden cost: Spotify keeps a local search index and metadata cache. The desktop app is heavier than playing through the web player.
Fix: Use Apple Music if you’re already in the Apple ecosystem — it’s tightly optimized for Apple silicon. If you stay on Spotify, lower streaming quality from Very High to Normal when on battery.
Adobe Creative Cloud apps
Typical drain: 8-15 watts during active editing, 2-4 watts idle.
Photoshop, Lightroom, Premiere, After Effects all run heavy background processes for syncing, fonts, and “creative cloud helper.” The Adobe Update Daemon alone can pull 1 watt on its own.
Fix: System Settings, General, Login Items & Extensions. Disable “Adobe Creative Cloud” and “Adobe CCXProcess” from launching at login. Launch Adobe apps manually when you need them.
Photos (during indexing)
Typical drain: 3-6 watts for hours after import.
Photos runs facial recognition, object recognition, and OCR text extraction in the background. After importing a few thousand photos, this can run for 4-8 hours, even when the app is closed.
Fix: Connect to power before importing large batches. Or temporarily disable the background analysis: Photos, Settings, General, uncheck “Show Memories notifications” and the analysis will complete faster.
Backup software (Time Machine, Backblaze, Carbon Copy Cloner)
Typical drain: 2-4 watts during backup.
Time Machine snapshots run hourly by default. Backblaze and Carbon Copy Cloner run continuously.
Fix: Time Machine should pause automatically on battery, but verify in System Settings, Time Machine. For Backblaze: Backblaze menu bar icon, Settings, Schedule, “When My Computer Is Idle” or “Once a Day.” For CCC: schedule manually.
Dropbox / Google Drive / OneDrive
Typical drain: 1-3 watts idle, 5+ watts during heavy sync.
Each cloud sync app indexes its watched folder and uploads changes in real time. If you’re working in a folder with many small files (a code repo, a Lightroom catalog, an Xcode project), the sync agent can run hot for hours.
Fix: Pause sync when on battery. Most clients have a “Pause” option in their menu bar icon. For Dropbox specifically, mark large folders as “Online only.”
Zoom
Typical drain: 5-12 watts during calls.
Video encoding and decoding plus background processes for Zoom Phone, Zoom Apps, and the auto-update daemon.
Fix: Quit Zoom when not in a call. Disable “Zoom Background” and “Zoom Apps” in Zoom settings if you don’t use them.
Discord
Typical drain: 2-4 watts.
Electron-based, like Slack. The “Voice & Video” subsystem keeps audio drivers initialized even when you’re not in a voice channel.
Fix: Discord, Settings, Voice & Video, set Input Mode to Push to Talk so the mic isn’t constantly active.
Things that look like apps but are actually macOS
Three macOS subsystems often show up high in Energy:
WindowServer: handles all rendering. If it’s pulling 5+ watts at idle, you usually have an external monitor at high resolution, lots of windows open, or a wallpaper that’s animating. Check System Settings, Wallpaper.
mdworker / mds_stores: Spotlight indexing. Spikes after big file changes or system updates, then settles. If it’s running for over 24 hours straight, force a reindex (add your drive to Spotlight Privacy, then remove it).
kernel_task: thermal throttling. If kernel_task is at 200%+ CPU, your Mac is hot. Move off the bed/couch, check the vents, ambient temperature. Apple silicon Macs handle thermals better than Intel but still throttle in 95°F+ rooms.
The 10-minute battery audit
Run this monthly:
- Activity Monitor, Energy tab, sort by 12 hr Power
- Note anything above 1.5 watts
- For each: do you actively use it? If no, uninstall. If yes, check its settings for a “battery saver” or “power” mode
- System Settings, General, Login Items & Extensions — disable anything you don’t need at login
- System Settings, Battery, Battery Health — check capacity and condition
A clean install of macOS on an M2 with no third-party apps idles around 0.4 watts. If yours is at 4 watts at idle, you have 3.6 watts of preventable drain — about 5 hours of battery life sitting on the table.