Check battery health through System Settings

Open System Settings (or System Preferences on older macOS versions), then click General in the sidebar. Select About, then click the System Report button. In the window that opens, click Power in the left sidebar. Look for the line labeled Condition — this is your battery's current health status.

The Condition field will show one of several messages. Normal means your battery is working as designed. Replace Soon means the battery still holds a charge but is degrading and you should plan a replacement within weeks or months. Replace Now means the battery has degraded significantly and you should replace it soon. Service Recommended indicates a potential hardware issue that Apple should evaluate.

This same System Report window also shows you Full Charge Capacity and Design Capacity. Full Charge Capacity is what your battery can hold right now; Design Capacity is what it held when new. If Full Charge Capacity is 80% of Design Capacity or higher, your battery is still in good shape. Below 80% means noticeable wear.

Key Takeaways

  • Battery health appears in System Settings > General > About > System Report > Power, under the Condition field.
  • Normal condition means your battery is working as designed; Replace Soon or Replace Now means degradation is underway.
  • Full Charge Capacity divided by Design Capacity tells you what percentage of original capacity remains — 80% or higher is still healthy.
  • Battery health degrades naturally over time and charge cycles; no setting or software can restore lost capacity.

What Full Charge Capacity and Design Capacity actually tell you

Every MacBook battery is rated for a certain number of charge cycles — typically 300 to 1,000 depending on the model and year. A charge cycle is one complete discharge from 100% to 0%, or the equivalent spread across multiple partial charges. After that many cycles, the battery's chemical ability to hold a charge diminishes.

Design Capacity is the amount of energy your battery could store when it left the factory. Full Charge Capacity is the amount it can store today, after however many cycles you have put it through. If your MacBook is two years old and you charge it daily, you have completed roughly 700 cycles. At that point, Full Charge Capacity might be 75% to 85% of Design Capacity — that is normal wear, not a defect.

You can also see Cycle Count in the same System Report window. This number tells you how many complete charge cycles your battery has completed. Compare this to your MacBook model's rated cycle count — you can find this on Apple's support pages by searching your model number and "battery specifications." If your cycle count is still well below the rated number and your Full Charge Capacity has dropped sharply, a hardware issue may be present.

Why battery health declines and what you can control

Battery degradation is chemical and unavoidable. Lithium-ion batteries lose capacity every time they charge and discharge, and they also lose capacity when exposed to heat or stored at very low charge levels for long periods. You cannot stop this process, but you can slow it down.

Keep your MacBook cool — avoid using it on soft surfaces that block air vents, and do not leave it in a hot car or direct sunlight. Avoid letting the battery drain completely to 0% regularly; instead, charge it when it reaches 20% to 30%. If you are not going to use your MacBook for weeks, store it at around 50% charge in a cool place, not fully charged or fully drained.

macOS also includes a feature called Optimized Battery Charging, found in System Settings > General > About > System Report > Power. When enabled, it slows charging to 80% during the day and only charges to 100% when you typically unplug the device. This reduces the time the battery spends at full charge, which slows degradation. Turning this on is one of the few software steps that genuinely extends battery lifespan.

When to replace your MacBook battery

If your Condition shows Replace Soon or Replace Now, or if Full Charge Capacity has dropped below 80% and you notice your MacBook shuts down unexpectedly when unplugged, a replacement is worth considering. The timing depends on how much battery life you need — if you work at a desk most of the time, you can wait longer than if you travel frequently.

Battery replacement costs vary by MacBook model and year. Older models with user-replaceable batteries are rare; most modern MacBooks require a technician to open the case. You can have Apple replace the battery at an Apple Store or Apple Authorized Service Provider, or you can use a third-party repair shop. Get a quote from at least two places before deciding.

If your MacBook is still under warranty or covered by AppleCare+, battery replacement may be covered if the Condition shows a problem. Check your coverage status in System Settings > General > About > System Report, or visit Apple's support website and enter your serial number.

Reading the System Report battery information correctly

The System Report window shows several fields related to your battery. Condition is the most important — it is Apple's assessment of whether the battery is working normally or needs attention. Full Charge Capacity and Design Capacity are measured in milliamp-hours (mAh) and tell you the actual versus original energy storage. Cycle Count is the number of complete charge cycles completed.

You will also see Current Charge, which is straightforward how much charge is in the battery right now — this changes every time you charge or use the MacBook. Amperage shows how fast the battery is charging or discharging at this moment; this number fluctuates depending on what you are doing. These two fields are less useful for assessing long-term health.

Some older MacBooks also show Temperature in the System Report. If this number is consistently above 50°C (122°F) during normal use, your MacBook may be running too hot and you should check that air vents are clear and the device is on a hard, flat surface.

Checking battery health from the command line

If you prefer to use Terminal, you can view battery information without opening System Settings. Open Terminal (found in Applications > Utilities) and type the following command:

system_profiler SPPowerDataType

Press Enter. Terminal will display the same battery information that appears in System Report, including Condition, Full Charge Capacity, Design Capacity, and Cycle Count. This method is faster if you check battery health regularly, and you can save the output to a text file to track changes over time.

You can also run pmset -g batt to see a quick summary of current charge and charging status, though this does not show the detailed health information that SPPowerDataType provides.

Frequently Asked Questions

Is it normal for Full Charge Capacity to be below 100%?

Yes. Even a new MacBook may show Full Charge Capacity slightly below 100% due to manufacturing variation and the first few charge cycles. Once you have used the MacBook for a few weeks, Full Charge Capacity stabilizes. Anything above 80% of Design Capacity is considered healthy; below 80% indicates noticeable wear.

Can I improve my battery health by resetting the SMC or NVRAM?

No. Resetting the SMC (System Management Controller) or NVRAM can fix charging problems like the battery not charging past a certain percentage, but it cannot restore lost capacity. Battery degradation is chemical and permanent. If your Condition shows Normal but charging is stuck, an SMC reset may help — contact Apple Support for instructions specific to your model.

What does "Service Recommended" in the Condition field mean?

Service Recommended indicates that macOS has detected a potential hardware issue with the battery or charging system, not just normal wear. This could mean the battery is swelling, the charging circuit is faulty, or the battery is not communicating correctly with the system. Contact Apple or an authorized service provider to have it evaluated — do not ignore this status.

How often should I check my battery health?

Checking once every few months is reasonable if you want to track degradation over time. If you notice your MacBook shuts down unexpectedly when unplugged, or if charging seems slow or stuck, check when ready. For most users, checking once or twice a year is sufficient.

Will using my MacBook while it charges damage the battery?

No. Using your MacBook while plugged in does not damage the battery. However, heavy use while charging generates heat, which can accelerate degradation over time. If you regularly use your MacBook for demanding tasks while plugged in, make sure air vents are clear and the device is on a hard surface to allow cooling.