Laptops are at their most convenient when not plugged in — where their portable nature can really shine. To maximize that convenience, you'll want to make sure your laptop is lasting as long as it should. While there are many different types of laptops, each specialising in its own niche, there are still ways to figure out whether your laptop is receiving the proper mileage.

You shouldn't need one of the best laptops on the market to see a decent battery duration. By knowing how long a given laptop's battery should last on a single charge, you can avoid having to replace a battery early in your laptop's life. While most laptop batteries can be replaced without being brought into a repair shop, and warranties can sometimes cover premature battery death, generally replacing batteries is an expensive process that can often require niche tools (such as niche, specialized screwdriver heads). It's best to know ahead of time if you're getting your money's worth, as well as how to optimize battery life by changing settings and knowing which activities will drain power the fastest.

To start, it's important to look at the type of laptop you have. The general range for modern laptops will lie somewhere between four and 12 hours from a single charge, but that's a pretty wide net. Premium-thin and Ultrabook laptops will last near the upper end of that tier (at eight to 12 hours, with some even reaching 15 under optimal conditions), whereas more standard laptops will last about six to 10 hours — or four to seven hours if it's a budget-friendly machine. Gaming laptops will drain significantly faster, and you should only expect about two to four hours from them.

A laptop's niche is only part of the equation, though, as the type of charger you're using can also subtly affect battery life. Aftermarket chargers in particular may not deliver the precise voltage you need and could end up stressing your battery. Though an aftermarket charger isn't a complete recipe for disaster, it's ill-advised if you want your battery to reach its full potential.

To reach that full potential for each of these bounds, you'll need to optimize things. There are some key settings to change for extended laptop battery life, such as turning down display brightness, closing background apps and tabs, and lowering your display's refresh rate. You could also switch to a power-saving mode in your laptop's power management settings, though you may need to switch out of this mode to carry out a demanding task. 

On the subject of demanding tasks, it's not only important to keep an eye on your laptop battery through settings, but also through how you use your laptop. Gaming's the obvious one, as even laptops explicitly designed for it run out of power quickly — but video editing, video streaming and 3D rendering are all quite intensive. If you know you'll need to engage with one of these activities, it's important to plan ahead — whether that's by getting a solid power bank or by making sure you can reach a socket.

You'll also want to keep your laptop in the right conditions. Chiefly, you'll want to maintain an ideal moderate temperature of 68 to 77 degrees Fahrenheit. Extreme heat (temperatures of 95 degrees Fahrenheit and above) could cause permanent damage to lithium-ion batteries, while cooler temperatures (about 32 degrees Fahrenheit and below) will make those batteries temporarily less efficient.

Furthermore, you should avoid using all of that battery up at once. Letting your battery run out multiple times could cause permanent damage to your laptop battery due to continued cell drain. Similarly, try not to keep your laptop plugged in too long when fully charged, as this could also lead to degradation of the battery. For this reason, it can be good practice to follow the 40-80 rule, where you start charging at 40% battery and stop at 80%, thereby avoiding either extreme — though this is certainly not strictly necessary and not always achievable.