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If you're in a tough spot right now, there are things you can do to extend the battery life immediately. None of these actions will actually increase the amount of power left in the battery, but instead will reduce the amount of power the laptop is using, letting you squeeze in a few more precious minutes before the battery goes kaput. The name of the game in these instances is power consumption, and you need to reduce yours to as little as possible.
1. Activate Your Laptop's Battery Saver Mode or Eco Mode
Designed with these sorts of circumstances in mind, most Battery-Saver or Eco modes will engage a number of automatic changes to lengthen usable battery life—many of the same changes we'll be making here. This saved profile will adjust your laptop's settings and shift components into low-power states to help you ration your remaining juice a bit longer.
Once you've turned on the automatic battery-saver tool, there are still plenty of steps to take to eke out even better efficiency. This is done by turning off unnecessary devices, adjusting settings to reduce power consumption, shutting down unwanted apps and processes, and adjusting your activities to use less power.
2. Disable Unused Devices and Ports
The easiest way to reduce power consumption is to simply turn stuff off. Every component in your laptop needs power to function, but that doesn't mean you need to power all of those components all the time. Start by disconnecting any unneeded peripherals (like a USB mouse or external drive) and turning off the biggest power hogs, like Wi-Fi and Bluetooth radios, graphics processors, and unused optical drives.
WARNING: Before disabling any component or device, stop and make sure that this device is not in use, and that it is not essential to continuing operation of the laptop. For example, you DO NOT want to disable the hard drive that houses the operating system, or the processor the runs the entire laptop. Only disable those devices you are comfortable turning off.
To disable unused devices on a Windows system, open up your system's Control Panel and find the Device Manager. In the Device Manager, individual components are grouped by category. For example, Network Adapters will often include both the LAN adapter, which provides Ethernet connectivity, and Wi-Fi, for wireless networking.
The four standard candidates for saving power are the graphics card (found under Display Adapters), the optical drive (found under DVD/CD-ROM Drives), and the Ethernet and Wi-Fi adapters (under Network Adapters). Find the device you want to shut down within the relevant category. Right click on the device name, and select "Disable" from the drop down menu.
While you're in the Device Manager, you can also turn off any unused ports. Just like an extension cord left plugged into an outlet, these unused plugs still have power going through them, and losing some in the process. The actual impact on battery life will be minimal, but if you need to eke out another minute or two of life, this will help. Take a quick glance at your ports, and turn off anything that's not being used, like USB ports with nothing connected to them.
While you can disable USB ports on a Mac using the terminal program, it's something that IT administrators would use to lock down Macs for security purposes. We don't recommend doing it as an end user because it may make your system act up. You can, however, disable Bluetooth and Wi-Fi from the Menu bar at the top of the screen.
3. Adjust Your Settings
While you'll still have to use the display and the keyboard, you can adjust the settings for each to reduce power consumption. One often overlooked power drain is keyboard backlighting. Unless you're in the dark, and need the backlight just to make out each key, turn the backlight off entirely. You can typically assign a hotkey for this function.
The next power drain is your screen. While you need to keep the up and running to use the laptop, you don't necessarily need it running at 100-percent brightness or full resolution. Many laptops will have hotkeys for increasing and decreasing the screen brightness, but if not, it can be adjusted in the control panel. Reducing the display to 50 percent when you're running on battery power can add a significant amount of time.
Additionally, if you're simply typing up a document, you don't need all of the detail offered by a 1080p or higher display. Dialing down the screen resolution to a basic 1,366-by-768 resolution or lower reduces the amount of power used in graphics processing without negatively impacting your ability to work, letting your laptop a bit longer than at full resolution.
Finally, turn off or turn down the sound. If you need to hear, drop the sound down as low as you can, and consider switching from the laptop's larger speakers to a set of tiny earbuds to get the audio piped right to your ears. Whenever possible, just mute the laptop altogether. That way, the speakers won't be getting any power, and you'll buy yourself some more precious time.
4. Turn Off Apps and Processes
It's not just the hardware that's stealing your battery juice. Multiple apps and processes running on your system will also chew through battery life more quickly. As with the hardware, start by turning off anything that isn't being used.
In Windows, start by taking a look in your System Tray, the collection of icons in the lower right corner of the desktop, next to the clock. On the left end of the System Tray, select the icon to display hidden icons. Take note of which apps are running in the background.
Open up the Task Manager by pressing Ctrl+Shift+Esc, or use Ctrl+Alt+Del and select Task Manager from the menu. Once in the Task Manager, look at the open apps—you may find that a program or two have been left running simply because you forgot to close a window instead of minimizing it.
Next, go to the Processes tab. This shows you what processes are currently running on your machine. While some of these are needed, some, like those associated with music and video players or cloud storage services (like Dropbox or Google Drive) can be disabled without causing any problems.
For MacBooks, the process is a little different. Take a look at System Preferences > Users&Groups for a menu called Login Items. Delete any power-hungry programs that you don't need anymore, or disable things like Google Chrome's automatic launch at startup. You can also see programs that are using a lot of power at any given moment by holding down the Option key, then clicking on the battery indicator in the Menu bar. Alternately, you can open the Activity Monitor utility to see a list of all the programs and processes you currently have open , and which of these are using the most power. You can stop these processes by selecting the program and then clicking the Stop icon. Power Nap is an Apple OS X feature that checks your email and twitter feeds for activity while the system is asleep. If you are trying to maximize battery life, it would be wise to turn that feature off.
5. Simplify
You can also stretch your battery life by simplifying your own activities. Multitasking is nice when you have full power, but running several programs at once puts a greater load on the processor and draws more power. Adjust your computer use by sticking to one application at a time and avoiding resource-intensive programs.
Start by single-tasking—if you need to type up a document, close any additional programs. You'll get longer battery life by not running Spotify in the background. If you need to keep some tunes going, switch from streaming media to locally stored songs—you'll still be using some extra power to play them, but streaming media over Wi-Fi also uses the laptop's wireless radio.
You might also benefit from switching to simpler tools for the same tasks, like opting for a simple text file instead of a Word document. With fewer features and none of Word's automatic actions (like Spell Check and Autosave), you can do all the writing you need without using quite so much power. Some activities you'll want to avoid entirely, like photo and video editing tools, which place a significant load on the processor and graphics card, and are real power hogs.
By eliminating unnecessary power uses, you should be able to extend the life of your battery in those moments that you find yourself high and dry.
