MacBooks use lithium-polymer (Li-Po) batteries, a variant of lithium-ion batteries. These cells store energy by the movement of lithium ions between two electrodes: the anode (graphite) and the cathode (cobalt or nickel oxide). When you use your MacBook on battery power, the ions migrate from the anode to the cathode, releasing energy. Charging reverses the process.
Over time, this repeated movement degrades the electrode materials. Chemical residues accumulate and gradually reduce the quantity of ions that the battery can store. This is a natural and inevitable process: even a battery that is never used loses 2 to 3 % of capacity per year simply by remaining in storage.
MacBook batteries are made up of several cells (generally 3 to 6, depending on the model) connected in series and in parallel. An integrated charge controller (Battery Management System) monitors the voltage, temperature and current of each cell to ensure a safe and even charge.
A charge cycle is equivalent to using 100 % of the battery's capacity, spread over one or more charges. In practical terms: if you use 50 % of the battery one day, recharge it, then use 50 % the next day, you have completed a single charge cycle.
Apple designs its batteries to retain at least 80 % of their original capacity after 1,000 cycles. This threshold is reached on average after 3 to 5 years of daily use, depending on the intensity of use.
Click on the Apple menu, hold down the Option and click on System information. In the sidebar, select Power supply. Under «Battery information», you'll find the number of cycles, the maximum capacity and the state of the battery.
| Number of cycles | Estimated condition | Recommended action |
|---|---|---|
| 0 à 300 | Excellent | Continuing good practice |
| 300 à 600 | Good | Monitor maximum capacity |
| 600 à 900 | Moderate wear | Anticipating a replacement |
| 900 à 1000 | End of life approaches | Planning the replacement |
| More than 1000 | Beyond the planned duration | Recommended replacement |
Hold down the Option and click on the battery icon in the menu bar. The status displayed (Normal, Replace soon, Replace now, Repair battery) gives you an immediate indication.
On macOS Ventura and later versions, open System settings, click on Battery, then on Battery status. The maximum capacity as a percentage tells you exactly how much of the original capacity is left.
For full data (number of cycles, capacity in mAh, temperature, voltage), go to System information via the Apple menu (Option + click on «About this Mac»). The Power section details all the battery's technical data.
Battery life varies considerably depending on the model, processor and usage. Here are the autonomies announced by Apple (web browsing, Wi-Fi active) and those we observed in the workshop during our calibration tests:
| Model | Apple battery life | Actual range recorded | Battery capacity |
|---|---|---|---|
| MacBook Air M3 (2024) | 6 p.m. | 1 to 4 p.m. | 52.6 Wh |
| MacBook Air M2 (2022) | 6 p.m. | 12 to 15 hours | 52.6 Wh |
| MacBook Air M1 (2020) | 6 p.m. | 12 to 15 hours | 49.9 Wh |
| MacBook Pro 14″ M3 Pro (2023) | 5 p.m. | 12 to 15 hours | 72.4 Wh |
| MacBook Pro 16″ M3 Max (2023) | 10 p.m. | 2 to 6 p.m. | 100 Wh |
| MacBook Pro 13″ Intel (2020) | 10 a.m. | 6 to 8 hours | 58.2 Wh |
| Intel MacBook Air (2020) | 11 a.m. | 7 to 9 hours | 49.9 Wh |
| MacBook Pro 15″ Retina (2015) | 9 a.m. | 5 to 7 hours | 99.5 Wh |
| Habit | Why it works | Estimated impact |
|---|---|---|
| Activate optimised charging | Limits the charge to 80 % when the Mac is plugged in for long periods, reducing chemical stress | +1 to 2 years lifespan |
| Avoid extreme temperatures | Lithium-ion degrades rapidly above 35°C and below 0°C | Major in hot climates |
| Do not regularly discharge to 0 % | Deep discharges stress cells and accelerate degradation | Moderate |
| Keeping macOS up to date | Updates improve power management and correct consumption bugs | Varies according to the bugs fixed |
| Use a suitable charger | An undersized charger causes the charging circuit to work continuously | Low but cumulative |
| Disconnect at 100 % if no optimised load | Keeping a battery at 100 % at all times accelerates chemical degradation | Not necessary if optimised load is active |
| Using MacBook regularly on battery power | Batteries are designed to be cycled, so a MacBook that is always plugged in can see its calibration drift. | Moderate |
To find out more about how to optimise your independence on a daily basis, consult our complete guide to solving rapid discharge problems.
Batteries don't give out overnight. The deterioration is gradual, but certain signs are not deceiving:
| Sign | What it means | Emergency |
|---|---|---|
| Maximum capacity at 80 % | Official Apple end-of-life threshold | Plannable |
| Service recommended« message in macOS | Apple has detected a capacity or performance anomaly | Plannable |
| Extinction at 20-30 % of remaining charge | Cells failing, gauge no longer reliable | Fast |
| MacBook only works when plugged in | Battery unable to supply sufficient current | Fast |
| Inflated battery | Abnormal internal chemical reaction, safety risk | Urgent |
| Abnormal overheating on load | Cell may be internally short-circuited | High |
A swollen battery is the most serious sign. Swelling is caused by the production of gas inside the cells, the result of advanced chemical degradation or a defect. This puts pressure on the internal components of the MacBook.
The visible signs of a swollen battery :
The trackpad is raised or no longer clicks properly. The lower case of the MacBook is deformed or no longer closes flat. The keyboard bulges in the centre. The MacBook no longer lies flat on a level surface.
At Réparation MAC, we treat swollen batteries as a priority. Replacement includes safe removal of the old battery and recycling in accordance with Belgian environmental standards. Contact us via our make an appointment specifying «inflated battery» for priority treatment.
| Option | Price guide | Deadline | Benefits | Disadvantages |
|---|---|---|---|---|
| Apple Store / authorised centre | 199 to €249 (excluding AppleCare) | 3 to 7 days | Original parts, 90-day Apple warranty | More expensive, longer lead times, often complicated to make an appointment |
| Independent workshop (MAC repairs) | Varies according to model | 1 to 2 hours | Fast, 180-day warranty, professional parts, free diagnosis | Not covered by AppleCare |
| DIY replacement | 50 to €100 (battery only) | 1 to 3 hours | The cheapest | Risk of damage, tools required, no warranty, invalid Apple warranty |
To find out the exact price for your model, consult our page dedicated to battery replacement or our detailed rates.
A new battery requires some attention in the first few days to ensure optimum calibration and maximum longevity:
Carry out an initial full charge of up to 100 % without interruption. Then use the MacBook on battery power for approximately 10 to 15 % before recharging. Repeat this complete cycle two or three times in the first week. This allows the charge controller to properly calibrate the battery gauge.
Activate the optimised load (System settings, Battery, Battery status) to protect the new battery from the start. Check that macOS is up to date to benefit from the latest power management optimisations.
Apple designs its batteries to retain 80 % of their capacity after 1,000 cycles. In normal daily use, this represents 3 to 5 years. With good habits (optimised charging, moderate temperatures), some batteries exceed 1200 cycles before reaching 80 %.
A battery that is simply worn out (reduced capacity but not swollen) does not present any immediate danger. The MacBook will operate with reduced autonomy. On the other hand, a swollen battery is a safety risk and must be replaced quickly.
No. Optimised charging only affects the battery charge level (it delays charging beyond 80 %). It does not affect processor performance, MacBook speed or screen brightness. It's purely a battery management setting.
On older models (MacBook Pro 2012-2015), this can be done with the appropriate tools (Pentalobe screwdriver, spatula). On recent models, the battery is stuck to the chassis with a strong adhesive, making the operation risky without experience. There is a real risk of piercing a cell or damaging a component.
Prices vary according to MacBook model. Our prices include the professional-quality battery, labour, diagnostics and a 180-day guarantee. See our detailed rates for the price corresponding to your exact model.
Yes, the professional-quality batteries we use are manufactured to the same specifications as the original batteries (capacity, voltage, connections). They are individually tested and covered by our 180-day guarantee. In 15 years of repairs, our rate of return on batteries is less than 2 %.
Apple no longer officially recommends calibration on recent MacBooks (from 2010). However, performing 2 to 3 full cycles in the first week helps the charge controller to adjust the accuracy of the gauge. It's not essential, but it's good practice.
Slight heat during charging is normal, especially with a fast charger (67W, 96W, 140W). However, if the MacBook becomes hot or the heat persists after a full charge, this may indicate a battery or controller problem. Consult our Mac overheating guide.
AppleCare+ covers free replacement if the battery retains less than 80 % of its original capacity during the period of cover. Normal wear and tear (battery at 82 %, for example) is not covered. AppleCare+ also does not cover damage caused by liquid or shock.
At Réparation MAC, replacement generally takes 1 to 2 hours, depending on the model. MacBook Pro Retina 2012-2015 are the fastest (battery screwed in). Recent models with a bonded battery require a little more time for secure removal.
Over 15 years of Apple expertise in Brussels. Free, no-obligation quote and 180-day guarantee on repairs.
