How to check your MacBook battery health properly
What Maximum Capacity, cycle count, condition, and raw capacity each tell you, and why one number is never the whole story.
Read the guide →Battery guides
Understand the numbers behind the battery icon.
Plain-English guides to battery health, power, charging, and the Apple-device readings WhatBattery works with.
How to read an iPhone battery from your Mac
Use the trusted Finder connection to inspect a connected device over USB or Wi-Fi without installing another iOS app.
Read the guide →Mac charging watts explained
Why a 96W charger does not always deliver 96W, what negotiated power means, and when a charger is genuinely undersized.
Read the guide →Prefer the live numbers?
WhatBattery puts health, watts, temperature, and cycles in the menu bar.