How to Check Battery Health on Mac
What Is Battery Health on Mac?
Battery health on Mac represents the maximum charge capacity of the battery compared to its original design capacity, expressed as a percentage that decreases over time due to chemical aging.
Every lithium-ion battery degrades with use. When a MacBook ships from the factory, its battery holds 100% of its design capacity. Over months and years of charge cycles, the battery's maximum capacity decreases as the lithium-ion cells undergo irreversible chemical changes.
macOS tracks this degradation and reports it as a percentage. A battery health reading of 87% means the battery can hold 87% of the charge it could when new. This metric helps determine whether the battery is aging normally or requires service.
How Do You Check Battery Health in macOS Settings?
macOS displays battery health in System Settings > Battery > Battery Health, where the status reads either "Normal" (battery is functioning as expected) or "Service Recommended" (capacity has degraded significantly).
Open System Settings, click Battery in the sidebar, then click the info (i) button next to Battery Health. macOS shows the maximum capacity percentage and a condition status.
"Normal" means the battery is performing within expected parameters for its age. "Service Recommended" appears when the battery has degraded below Apple's threshold — typically below 80% of design capacity — and may benefit from replacement.
For more detailed data such as cycle count and power draw, you would need to open System Information (Option+click the Apple menu > System Information > Power).MoniThor surfaces these values directly in the menu bar without navigating through multiple settings panels.
What Is a Battery Charge Cycle on Mac?
A battery charge cycle equals one full discharge of 100% total battery capacity, which can be split across multiple days — for example, using 50% on two consecutive days counts as one cycle.
Apple defines a charge cycle as discharging 100% of the battery's total capacity, not necessarily in a single session. Using 75% one day and 25% the next day completes one cycle. The cycle count increments only when the cumulative discharge reaches 100%.
Apple considers a MacBook battery consumed at approximately 1,000 cycles. At that point, the battery is designed to retain at least 80% of its original capacity. Modern MacBook models (M1 and later) may support higher cycle counts before reaching the 80% threshold.
How Does Battery Health Degrade Over Time?
Apple designs MacBook batteries to retain at least 80% of their original capacity after 1,000 charge cycles, with degradation accelerated by high temperatures, frequent fast charging, and sustained full-charge storage.
Battery degradation is a chemical process. Each charge cycle causes a small amount of lithium plating and electrolyte decomposition inside the cells. The rate of degradation depends on usage patterns and environmental conditions.
High ambient temperatures (above 35°C / 95°F) accelerate chemical aging. Keeping a MacBook on a hot surface or in direct sunlight while charging causes more degradation per cycle than normal room-temperature use.
Fast charging generates more heat inside the battery, which compounds the temperature effect. Storing a MacBook at 100% charge for extended periods also stresses the cells. macOS's "Optimized Battery Charging" feature mitigates this by pausing charging at 80% until you need the full charge.
What Battery Metrics Does MoniThor Display?
MoniThor displays battery percentage, time remaining, health percentage, charge cycle count, power draw in watts, voltage, and charging state directly in the macOS menu bar — all visible without opening System Settings.
MoniThor consolidates every battery metric into the menu bar and its expanded dashboard. The current charge percentage and estimated time remaining appear at a glance. The health percentage and cycle count — data that macOS buries in System Information — are surfaced alongside power draw in watts and current voltage.
The charging state indicator shows whether the battery is charging, discharging, or fully charged. This real-time visibility helps identify power-hungry applications by correlating high wattage draw with specific tasks. Visit the Features page for a complete list of monitored metrics, or return to the home page for an overview of MoniThor.
How Can You Extend Your Mac Battery Lifespan?
Mac battery lifespan can be extended by avoiding extreme temperatures, enabling Optimized Battery Charging, avoiding full discharges to 0%, and reducing screen brightness when running on battery power.
Avoid extreme temperatures. Do not leave your MacBook in a hot car or use it on soft surfaces that block ventilation. Lithium-ion cells degrade fastest at temperatures above 35°C and below 0°C.
Enable Optimized Battery Charging. This macOS feature learns your charging routine and pauses at 80% until shortly before you typically unplug, reducing the time the battery spends at full charge.
Avoid draining to 0%. Deep discharges stress lithium-ion cells more than shallow cycles. Keeping the charge between 20% and 80% during normal use minimizes degradation per cycle.
Reduce screen brightness. The display is the largest single power consumer on a MacBook. Lowering brightness by even 20% can noticeably extend battery runtime and reduce charge cycles over time.
MoniThor helps with battery management by displaying real-time power draw in watts, making it easy to identify which activities consume the most energy. Learn more on the Pricing page.
Marcel Iseli is a software developer and the creator of MoniThor. He builds native macOS utilities focused on performance monitoring and system optimization, with a focus on lightweight, subscription-free tools.