Your MacBook’s battery slowly loses capacity as you use it — that’s normal. Knowing exactly where it stands tells you whether it’s healthy, whether a slowdown is the battery’s fault, and whether it’s worth a replacement. Here are three ways to check, from quickest to most detailed.
1. System Settings (the quick check)
- Open menu → System Settings.
- Click Battery in the sidebar.
- Click the ⓘ button next to Battery Health.
You’ll see Maximum Capacity — the percentage of the original capacity your battery can still hold — and a condition of Normal or Service Recommended. This is the fastest read, but it doesn’t show your cycle count or any history.
2. System Information (cycle count, for free)
- Hold Option and click the menu → System Information.
- Select Power in the sidebar.
- Under Health Information you’ll find Cycle Count, Condition, and the maximum capacity in mAh.
A charge cycle is one full 0–100% worth of discharge (it can add up over several partial charges). Modern MacBooks are rated for 1000 cycles before they’re expected to drop to 80% capacity. See our guide on what counts as a good cycle count.
3. A dedicated battery app (the full picture)
The built-in tools give you a snapshot, but not history, a forecast, temperature, live charging wattage, or your other Apple devices. A dedicated app fills those gaps. Mac 4 Breakfast shows maximum capacity, cycle count, condition, temperature and a true time-remaining estimate at a glance — plus a health forecast and a shareable report card — and it does it for every Apple device you own, not just the Mac.
How to read the numbers
- Maximum capacity ≥ 80% → healthy. Expect full-ish runtime.
- Below 80% / “Service Recommended” → the battery holds noticeably less; a replacement will restore runtime.
- Cycle count → how “used” the battery is. Low cycles with low capacity can indicate heat or charging habits, not just age — see limiting charging.
Capacity naturally fluctuates a few percent day to day and can even read slightly above 100% on a new battery — that’s the gauge calibrating, not a problem.