Tips to extend laptop battery life, on each charge and for years

Battery life means two different things

People use "battery life" for two separate measures:

• Runtime is how long the laptop runs on one charge. It depends on how much power the hardware draws: the screen, the processor, the radios and whatever apps are doing in the background. Settings change it immediately.
• Lifespan is how many years the battery keeps enough capacity to be useful. Every lithium-ion battery holds less charge as it chemically ages, and Apple describes that chemical age as the result of the battery's temperature history and charging pattern, not of time alone.

The two can pull against each other. Charging to 100% every day gives the longest runtime today and ages the cells faster; a charge limit gives up a little runtime to slow that aging. The right balance depends on where the laptop spends its day: on a desk next to a charger, or in a bag.

How to make a Windows 11 laptop battery last longer on each charge

Windows 11 keeps most battery settings in Settings > System > Power & battery. Work through them in this order, since the first two change the most for the least effort:

1. Pick a power mode. Under Power mode, choose Best power efficiency for On battery. Windows keeps a separate choice for Plugged in, so the laptop can run at full speed on the charger and save power away from it. Microsoft describes Best power efficiency as reducing power use by limiting background activity. If the setting is unavailable, a custom power plan is selected: open Control Panel > System and Security > Power Options and choose Balanced to bring it back.
2. Use energy saver. On Windows 11 version 24H2 and later, energy saver takes the place of battery saver. Choose the battery level at which it turns on by itself, or turn on Always use energy saver, and switch on Lower screen brightness when using energy saver. It is also a quick setting behind the battery icon on the taskbar.
3. Open Energy recommendations. This page lists the settings on your laptop that use more power than they need, such as brightness, a screen saver or long sleep timers, and offers Apply all. Depending on the hardware, it can set the screen to turn off and the laptop to sleep after 3 minutes (10 on some systems), stop USB devices when the screen is off, adjust brightness and contrast to the content shown, and, on laptops with a presence sensor, dim the screen when you look away and sleep when you leave.
4. Find the apps that drain it. Expand Battery usage and look at Battery usage per app. For an app that uses a lot of battery in the background, select More options > Manage background activity and change Let this app run in the background from Always to Power optimized (Microsoft's recommendation) or Never. Only apps that support background control show the option; quit the others when you are not using them.
5. Watch live power draw. In Task Manager (Ctrl+Shift+Esc), right-click the column header and add Power usage and Power usage trend to see which running processes draw the most right now. Check what a process does before you end it.

Display settings that save the most

Dell calls the display one of the largest power draws in a laptop, so it is where settings pay off first:

• Brightness. Lower it under Settings > System > Display. The automatic options that Energy recommendations can switch on, adaptive brightness and brightness and contrast adjusted to the content shown, save power by themselves; turn the content-based one off only if the changes distract you or you need accurate colour for photo and video work.
• Refresh rate. A higher refresh rate gives smoother motion and uses more power. Under Display > Advanced display, choose a dynamic refresh rate (DRR) if the screen offers one, which lowers the rate during static tasks, or pick a lower fixed rate.
• Dark mode. Choose Dark under Settings > Personalization > Colors. Microsoft notes the saving is largest on OLED displays.
• Graphics per app. Under Display > Graphics, set a demanding app to Power saving.
• Video. Under Settings > Apps > Video playback, choose Optimize for battery life, and optionally play video at a lower resolution on battery.

Sleep and hibernate

Shorter timeouts under Screen, sleep & hibernate timeouts save the power a laptop spends doing nothing. Microsoft has lowered the defaults: a modern standby laptop on battery now turns its screen off, and sleeps, after 3 minutes. Hibernate uses less power than sleep, and Microsoft suggests it when you will not use the laptop for a long stretch and cannot charge it; not every PC offers it. Dell's advice is simpler still: shut the laptop down before you put it in a bag or another enclosed space. Many of the same settings also decide how fast the laptop feels; our guide to optimizing PC performance covers that side.

Keep Windows, drivers and the firmware current too: Dell lists BIOS, chipset and power management driver updates among the first steps when troubleshooting a battery. Our guide to setting up Windows on a new computer shows where Windows Update and optional driver updates live.

How to make a MacBook battery last longer on each charge

macOS keeps its battery settings in System Settings > Battery:

1. Turn on Low Power Mode. It reduces energy use to increase battery life. The Energy Mode menu lets you choose Low Power, Automatic or High Power separately for On battery and On power adapter; Automatic is the default. From macOS Sequoia 15.1, you can also switch modes in Control Center.
2. Find the apps that use the most energy. In Activity Monitor, the Energy tab shows each app's Energy Impact, a relative measure of what it uses now, and on laptops 12 hr Power, its average over the last 12 hours. The Preventing Sleep column shows apps that keep the Mac awake.
3. Read the usage history. Battery settings chart the battery level and screen-on time for the last 24 hours, and energy usage for the last 10 days, so you can connect a short day to what you were doing.
4. Turn on the display and video options. Battery settings also offer Slightly dim the display on battery, and Optimize video streaming while on battery, which plays HDR video in standard dynamic range.

Apple also advises keeping a MacBook on the latest version of macOS.

Habits that save battery on any laptop

Some of the drain has nothing to do with the operating system:

• Keyboard backlight and accessories. Dell lists the keyboard backlight and connected external devices among the settings that affect runtime. Turn the backlight down in daylight, and unplug USB drives and other devices you are not using.
• Radios. Turn off Wi-Fi and Bluetooth when you do not need them, or switch on airplane mode when you are working offline.
• The right charger. Use the adapter made for the laptop or one rated for its wattage: Apple warns that an adapter below the wattage a Mac needs may charge it slowly or unreliably, and Dell advises against third-party adapters and batteries.
• Cold. In a very cold place the battery runs down faster, but Apple notes that this is temporary: runtime returns once the battery warms back to its normal range. Heat is different, as the next sections explain.

Why laptop batteries wear out

Lithium-ion cells lose capacity in two ways.

Cycle aging comes from charging and discharging. In a multi-year Sandia National Laboratories study of commercial lithium-ion cells, published in 2020, capacity faded faster as the depth of discharge increased, for every cell in the study. Running the battery from full to empty over and over wears it more than shallow top-ups do.

Calendar aging happens with time, even when the battery sits unused. The main mechanism is the slow growth of a passivation layer on the electrodes, the solid electrolyte interphase (SEI), which consumes lithium that would otherwise carry charge. A high state of charge and a high temperature both speed it up, and a 2016 study of calendar aging concluded that high storage states of charge should be avoided to maximize battery life. The Sandia paper, reviewing earlier calendar aging studies, reports the same pattern across chemistries: capacity loss during storage rose with state of charge, was especially fast for NMC and NCA cells held at 100%, and fell at lower temperatures.

So a battery ages fastest when it is kept full, kept hot, and run flat again and again. The vendors' advice follows from that. Microsoft suggests keeping the level roughly between 20% and 80% when you can and avoiding frequent deep discharges, and Apple, Microsoft and the laptop makers all ship settings that stop charging short of full.

What charge cycles and cycle count mean

A charge cycle is using energy equal to the battery's whole capacity, but not necessarily in one go. Apple's example: use half the charge one day, recharge fully, do the same the next day, and that counts as one cycle, not two. The cycle count is the number completed so far. Apple rates the batteries in current Mac laptops for a maximum of 1,000 cycles, at which point a battery is designed to keep up to 80% of its original capacity.

Cycles are only half the story. Calendar aging continues whether or not you cycle the battery, so measured capacity is the better guide to its health; the health checks further down show where to find it.

How to extend the life of a laptop battery with a charge limit

If the laptop spends most of its days on a desk or a dock, a charge limit is the most useful setting for its lifespan. Microsoft notes that keeping the battery at 100% all the time can make it deteriorate faster, and that with Smart charging you no longer need to unplug the laptop to avoid that.

A charge limit stops charging below full and holds the battery there while the charger stays connected. When the level drops, charging resumes and stops at the limit again; on a Mac, it resumes once the level falls more than 5% below the limit. When you need the full capacity for a trip, most tools offer a one-off full charge: Charge to Full Now on a Mac, Charge to 100% in the Surface app, or Instant Full-Charge Mode in MyASUS, which returns to the limit after 24 hours.

Where to find the setting, as of September 2026:

Which option to choose depends on how the laptop is used:

• Plugged in nearly all day (a desk, a dock, a reception or point-of-sale laptop): use the lowest limit available. HP recommends Maximize Battery Health Management for notebooks connected to power all day, Dell's Primarily AC Use is meant for the same case, and Microsoft's Surface Battery Limit, which stops at 50%, is intended for devices that are always connected, such as kiosks.
• Moving between desk and meetings: an adaptive or balanced option, such as Optimized Battery Charging on a Mac, Dell's Adaptive mode, which optimizes charging from your usage pattern, or HP's default, Let HP Manage My Battery Health, which HP recommends for laptops used both on power and on battery. ASUS suggests its 80% setting for laptops used on battery in meetings.
• Mostly on battery: leave the limit off, or turn it off before you travel. Microsoft suggests turning Smart charging off when you travel or expect to work far from an outlet.

Intel-based Mac laptops with Thunderbolt 3 ports have a simpler version, battery health management, which may temporarily reduce the maximum charge based on temperature history and charging patterns; it is the Manage battery longevity option in Battery Health.

Keep the battery cool

Heat is the other half of battery wear, and the damage it does is permanent. Apple rates MacBooks to work best at ambient temperatures of 10 to 35 °C (50 to 95 °F), calls 16 to 22 °C the ideal comfort zone, and warns that ambient temperatures above 35 °C can permanently damage battery capacity. Charging in that heat damages it further, and even storing a battery somewhere hot can harm it irreversibly. Microsoft's advice for Windows laptops is the same: try not to use or charge the laptop at high temperatures.

In practice, heat builds up when a laptop charges or works hard with nowhere for the warm air to go: on a bed or cushion that covers the vents, in a bag, or left in a car in summer. Give it a hard surface while it charges, and if it gets hot while charging inside a case, Apple suggests taking it out of the case first.

How to store a laptop you will not use for months

For a laptop going into a drawer, the charge level and the temperature decide how much capacity it has when it comes out:

1. Charge it to about half. Apple recommends around 50%, and Microsoft 40 to 60%. A battery stored completely empty can fall into a deep discharge state in which it no longer holds a charge; one stored full for a long time loses capacity.
2. Shut it down, rather than leaving it asleep.
3. Keep it cool and dry. Apple specifies a moisture-free place below 32 °C (90 °F).
4. Top it up. If storage lasts longer than six months, Apple recommends charging it back to 50% every six months, and Microsoft suggests checking the level periodically.

Check battery health on Windows with the battery report

Windows has a built-in battery report that shows how much capacity your battery has lost. Generate it from Command Prompt (Microsoft's steps open it with Run as administrator):

powercfg /batteryreport

The command saves an HTML file and prints its location, usually your user folder (C:\Users\<your name>\battery-report.html). Open it in a browser. Two options from Microsoft's reference help: /output chooses where the file goes, and /duration sets how many days of history to analyze.

powercfg /batteryreport /output "%USERPROFILE%\Desktop\battery-report.html"
powercfg /batteryreport /duration 7

Start with Installed batteries, which lists the design capacity, what the battery held when new, and the full charge capacity, what it holds now. The ratio between them is the wear. Dell treats a full charge capacity below 40% of design capacity as significantly degraded, time to replace the battery. The figure moves with temperature and recent use, so compare several reports over time rather than reading too much into one.

The rest of the report is useful for runtime problems:

• Recent usage shows periods of unexpectedly fast drain, and times when an app kept the laptop from sleeping.
• Battery capacity history shows how the full charge capacity has changed.
• Battery life estimates compare expected runtime with what you actually get.

Laptop makers' own tools rate battery health too. Dell, for example, checks it in Dell SupportAssist, and lists a health status of Fair or Poor among the signs that a replacement is due.

Check battery health and cycle count on a Mac

On a Mac laptop, open System Settings > Battery and look at Battery Health:

• Normal means the battery is working as it should.
• Service Recommended means it holds less charge than when it was new, or is not working normally. The Mac is still safe to use; the battery is due for service when the lower capacity gets in your way.

Click the info button next to the condition to see Maximum Capacity, the battery's capacity relative to when it was new. Expect it to read slightly under 100% even on a new Mac, and to change after a macOS update, when the Mac may recalibrate it. On older Macs or macOS versions without Battery Health, hold Option and click the battery icon in the menu bar; the status may read Replace Soon, Replace Now or Service Battery.

For the cycle count, hold Option, choose Apple menu > System Information, and select Power under Hardware; the count is under Battery Information. Apple advises relying on what macOS reports, since third-party battery apps may not be accurate.

When to replace a laptop battery

A battery rarely fails on a particular day; it fades. Replace it when one of these is true:

• Runtime no longer covers your working day, even with efficient settings. Dell lists a drop to less than 50% of the original capacity among the signs.
• The health check says so. On a Mac, that is Service Recommended, or a cycle count at the model's maximum: Apple recommends replacing the battery then for the best performance. On Windows, it is a full charge capacity far below design capacity in the battery report, or a Fair or Poor rating in the maker's tool.
• The laptop shuts down unexpectedly while the battery still shows charge remaining, which Dell lists among the signs.
• The battery swells. This one is not a judgement call.

Check the warranty before you pay. Apple's one-year limited warranty covers a defective battery, and with AppleCare, Apple replaces a battery that keeps less than 80% of its original capacity at no charge. Dell covers a laptop battery for one year, or for three years where the battery's description in the laptop's specifications says 3 Years Limited Hardware Warranty or Long Cycle Life (LL).

If the battery is built in, replacing it is a repair job rather than a swap. Apple directs Mac owners to an Apple Store, an Apple Authorized Service Provider or an Independent Repair Provider using genuine Apple parts, and offers Self Service Repair for some Mac models from 2020 onward in certain countries. Dell sells genuine batteries through the Parts & Repairs section of each laptop's support page.

For a business with a fleet of laptops, battery health belongs in the same place as the rest of the hardware records. Our IT support service keeps an asset register with advice on what to replace and when, and manages laptops from one console with Microsoft Intune or Jamf.