How long should a laptop battery last before it needs replacing?

What a charge cycle is

A cycle is not one plug-in. Apple's own definition is that a cycle happens when you use all of the battery's power, but not necessarily in one go. Use half the charge today, recharge, use half tomorrow, recharge, and that is one cycle across two days. Heavy daily use on battery adds cycles quickly. A laptop that lives on a desk adds them slowly.

Age also counts. Apple describes battery lifespan as tied to chemical age, which depends on temperature history and charging pattern, not only on how long ago the battery was built. Heat does the most damage. A laptop that sits in a hot bag or runs hot on a bed ages its battery faster than one used on a cool desk.

How many cycles to expect

The manufacturer's number is the one that matters for your model. Apple publishes a table and states that its batteries are designed to retain up to 80 percent of original capacity at the maximum cycle count. On its cycle count page, recent MacBook Air and MacBook Pro models are listed at 1000 cycles, and some older models at 300 or 500. Windows makers publish their own limits and they vary by model and by battery type, so check your manual or the support page for your exact model number rather than trusting a general figure.

Reaching the limit does not mean the laptop stops working. Apple says you can keep using the battery past its maximum cycle count, but you might notice reduced battery life.

How to check your own battery

Windows 10 and Windows 11

1. Right-click Start and choose Terminal (Windows 11) or Windows PowerShell (Windows 10). Command Prompt also works.
2. Type powercfg /batteryreport and press Enter.
3. Windows saves an HTML report in the current folder and prints the file path. Open it in a browser.
4. Compare the design capacity with the full charge capacity. The wider the gap, the more the battery has worn.

Microsoft documents this command as generating "a report of battery usage characteristics over the lifetime of the system" in its powercfg reference. Many Dell, Lenovo and HP laptops also ship a vendor app (such as a power or support utility) with its own battery health screen. When the two disagree, trust the one that reads the battery controller directly and note the date.

MacBook

Hold Option, click the Apple menu, choose System Information, then select Power under Hardware. The cycle count is listed under Battery Information. The thread on MacBook battery health goes through the System Settings route and what the status messages mean.

Signs it is time

Sign	What it usually means	What to do
Runtime has dropped to half or less of what you used to get	Capacity loss, confirmed by a report	Plan a replacement
Percentage jumps, such as 40 percent straight to 5 percent	Worn cells or a calibration problem	Run a battery report, then check for a vendor update
Laptop shuts off when unplugged	Battery cannot deliver current	Replace soon, and keep it plugged in meanwhile
Case, trackpad or keyboard bulges	Swollen cell	Stop charging it, unplug it, and get it serviced. Do not press on it or puncture it
"Service Recommended" or a battery warning	The system has judged the battery worn	Follow the manufacturer's service route

A swollen battery is a safety issue, not a convenience one. Do not leave it charging overnight and do not try to flatten it.

What slows the wear

Keep the laptop cool and out of hot cars. Apple recommends ambient temperatures between 50 and 95 degrees Fahrenheit (10 to 35 degrees Celsius) for MacBooks, and says charging in high heat can damage a battery further. If you store a laptop for months, leave it around 50 percent charged rather than full or empty. Many laptops now include a charge limit or "battery care" setting, which is covered in the thread on leaving a laptop plugged in.

Replace the battery or the laptop

If the laptop is otherwise fast enough for what you do, a battery replacement is usually the sensible repair. Use the manufacturer or an authorized service provider where the battery is glued in or the machine is under warranty. If the machine is also slow, short of memory or past its security updates, the battery is only one item on the list.