Laptop Battery Draining Fast? How to Get More Hours From a Charge

Your laptop used to last all day. Now you're hunting for a power outlet by lunchtime. Battery problems come down to two things: something is using too much power, or the battery itself has worn out. Here's how to tell which, and what to do.

All lithium-ion batteries lose capacity over time. After a few years, it's normal for a battery to hold noticeably less charge than when new.

Open Terminal and run:

powercfg /batteryreport

It saves an HTML report (the path is shown in the output). Compare Design Capacity with Full Charge Capacity. If full charge capacity is much lower, your battery has worn down.

System Settings → Battery → Battery Health (click the ⓘ). It shows the maximum capacity and whether service is recommended. You can see the cycle count in System Information → Power.

If the battery is badly worn, replacement is the real fix. See the end of this post.

• Windows: Settings → System → Power & battery → Battery usage shows which apps have used the most battery.
• Mac: System Settings → Battery shows usage history, and Activity Monitor → Energy tab shows current energy use by app.

Common culprits: web browsers with many tabs, video calls, games, cloud sync, and apps stuck in the background.

• Lower screen brightness. The display is one of the biggest power users.
• Use power-saving modes:
• Windows: Settings → System → Power & battery → turn on Energy saver (called Battery saver on older versions), or set Power mode to "Best power efficiency."
• Mac: System Settings → Battery → Low Power Mode.
• Close unused apps and tabs.
• Turn off keyboard backlighting when not needed.
• Disconnect unused devices: USB accessories draw power.
• Turn off Bluetooth if you're not using it.
• Reduce the refresh rate: high-refresh-rate screens (120 Hz and above) use more power. Windows can switch to a dynamic refresh rate in display settings.

Operating system, driver and firmware updates often include power-management improvements.

If the laptop is warm and the fan runs while idle, something is working in the background. Open Task Manager or Activity Monitor and look for high CPU use.

• Avoid extreme heat. Heat is the biggest enemy of battery health. Don't leave laptops in hot cars or use them on beds and pillows.
• Use built-in charge limits. Many laptops can stop charging at around 80% when plugged in most of the time. On Macs, Optimized Battery Charging does this automatically. Windows laptops often have this setting in the manufacturer's app.
• Don't worry about occasional full drains. Modern batteries don't need "calibrating" regularly, and frequent deep discharges add wear.

If your laptop's case is bulging, the trackpad is raised or won't click properly, or the bottom panel is pushed out, the battery may be swelling. Stop using and charging the laptop, and get the battery replaced professionally. Don't puncture or press on it.

A battery replacement is usually far cheaper than a new laptop. Use the manufacturer's service or a reputable repair shop, and avoid very cheap unbranded batteries.

Check your battery's health first. If it's worn, replace it. If it's healthy, find the power-hungry apps, dim the screen, and use power-saving modes to get your hours back.