If you want to keep gaming on the go after that brief amount of time, you'll need to charge. But you don't need Nintendo's Switch dock for that. The Switch charges over USB Type-C, which allows it to be used with portable chargers.
The Switch doesn't include a USB Type-C cable, but you can grab one for cheap. A USB Type-C to USB Type-A (that's the rectangular kind you usually see on laptops) cable costs less than $7, while USB Type-C cables are a little pricier, around $20.
These cables will let you connect your Switch to a portable battery. Here's the rub: depending on which game you're playing, the system may not charge as fast as it uses energy.
Reports suggest Breath of the Wild drains faster than a portable battery can recharge it, but less taxing games like Snipperclips shouldn't pose the same issue. You can check out our roundup of the best portable chargers to find the best fit for your play habits.
Some gamers have found that portable batteries meant for phone just don't cut it, so you may want to consider a high-capacity, high-voltage USB-C portable charger meant for laptops such as the $75 Dell Power Companion. It's more to carry around, but it's also more time playing your Switch.
If you cop a USB Type-C to Type-A cable, you'll be able to charge in other familiar ways. You could use a phone or tablet wall charger, USB ports in cars, planes or trains, or even with a laptop.