Laptops With the Best Battery Life

Life is too short to worry about whether you're going to make it through the day on a single charge

A person looking at a laptop display while seated at a desk
Photo: Shannon Fagan/Getty Images

There are many things you can do to stretch the battery life of a laptop. But if you want the device to deliver a full day’s work, you need to start with a model that packs plenty of power.

The LG Gram 14 (2021), for example, can deliver nearly 27 hours of battery life, according to our testers. That’s more than three full workdays of juice, with enough left over to screen an episode of "The Falcon and the Winter Solider" on Disney+.

In other words, we’ve come a long way from the days when you had to carry a power cord with you at all times.

Because people depend on their laptops day and night, we test the battery life on every model that enters our labs. And according to Antonette Asedillo, who oversees that testing, the protocol is designed to resemble real-world use.

We start by setting the brightness of the computer’s display to 200 nits, a level that works indoors and out. Then, with the battery fully charged, we cycle the laptop through a series of 10 web pages, downloading them continuously until the laptop shuts down.

The web pages are stored on a server in our lab and transmitted over a WiFi network set up specifically for this purpose. We use the laptop’s default web browser, rather than a third-party browser, to be more representative of how everyday consumers behave.

In a second test, we play 4K video (locally stored, not streamed over the internet, because using WiFi can deplete the battery even faster) until the power is fully drained.

“It’s a good way to gauge how well a battery will hold up during heavier workloads,” Asedillo says.

While your actual battery life will vary depending on what you’re doing, what’s important is that we test each laptop the same exact way so you can compare models with confidence. Here’s a list—available to CR members—of laptops that delivered great battery life figures in our testing.