Nintendo built the Switch for portable, on-the-go play, which means it depends on a battery. To eke out as much play time as possible, you'll want to try a few of these battery-saving tweaks. First, dim the brightness by tapping the Home button on the lower right, going to the quick-settings menu, and sliding down the brightness bar. In a pinch, activating airplane mode from that same quick-settings menu will disable the Switch's Bluetooth and Wi-Fi, which both drain the battery life. Finally, if you're prepared to spend some cash, invest in a USB-C portable power pack. You need something that has an output of 5V-3A or higher and that specifically mentions its compatibility with Switch, such as the Anker PowerCore+ 20100 ($66 on Amazon).