Unrounded health, live power, charger performance, and a replacement forecast, for your Mac, iPhone, iPad, and Bluetooth accessories.
Free and open source. Pro is a £9.99 one-time purchase. See installation options.
WhatBattery turns the data macOS already holds into answers you can act on: how worn the battery really is, where the power is going, why it drained overnight, and when it's likely to need replacing. Every one of those is something WhatBattery can actually back up, and it says so plainly on the days it can't.
System Settings rounds battery health to a whole number, so anything from 99.5% up shows as 100%. WhatBattery works from the raw capacity figures and shows one decimal place, alongside cycle count and Apple's own service condition.
You see wear starting months before a rounded number admits it.
See how true health works →
See the real watts flowing into or out of the battery, the charger your Mac negotiated, voltage, and temperature. Pro also ranks your own apps by live watts and keeps the day's top power users.
Activity Monitor gives you an energy score. WhatBattery gives you watts and tells you honestly what cannot be attributed to an app.
Explore live power and app usage →
Pro's Sleep tab shows what happened during the last sleep: charge lost, how long, and how many times the Mac woke. Wake reasons are grouped and counted in plain English, with the raw macOS string underneath, and a live list shows what's holding the Mac awake right now.
A confident zero would be the easy answer. WhatBattery says when it genuinely doesn't know instead.
See what happened while it slept →
Pro builds a long-term health record and projects the window in which your Mac is likely to reach 80% health, then flags it if wear starts accelerating past its own trend. That record doesn't start empty: the pack's lifetime extremes and the gauge's last recalibration count have been sitting on the chip since before you installed anything, and WhatBattery reads them straight out.
Not just “91% today”, but a replacement window you can budget around, and silence when the history is too thin to support one.
See battery history and runway →
Start with the Mac. Add the iPhone or iPad you connect to it. Keep an eye on the accessories around it too.
True health, cycles, live watts, temperature, charger details, service condition, and the current power state from the menu bar.
Explore all features →Read health, cycle count, temperature, voltage, and live power from your Mac over USB or Wi-Fi. Nothing to install on the device.
See connected-device health →See live levels for supported keyboards, mice, trackpads, and AirPods. Pro forecasts when they will die and warns you first, with a menu bar readout.
See accessory forecasts →Small Mac utilities that explain what the hardware is actually doing.WhatBattery joins WhatCable and WhatPort in the Bitmoor product family.
The free app is a useful battery monitor on its own: unrounded health, live watts, and Bluetooth accessory levels. Pro adds history, forecasts, connected-device tracking, and evidence you can export.
No. It is strictly read-only. It reads battery and power data through Apple's interfaces and never writes to the battery, enforces a charge limit, or changes charging behaviour.
The App Sandbox blocks the low-level IOKit and SMC reads WhatBattery needs. It ships directly as a Developer ID-signed and Apple-notarised app, so it opens without a Gatekeeper warning.
Trust the Mac once over a cable, then read the device over USB or Wi-Fi using the same connection Finder uses. No app is installed on the device. Read the setup guide.
£9.99 once, for up to two Macs. There is no subscription and purchases have a 14-day money-back guarantee.
Free, open source, signed, and notarised for Apple Silicon Macs running macOS 14 or later.
