My favorite table for getting work done at my local coffee shop has no nearby outlet. To keep working after my computer hits 10 percent, I use a laptop power bank. Luckily, after a couple years testing batteries for Engadget, I have a good backstock to choose from. These high-capacity batteries are also excellent for travel, with the ability to recharge a phone, tablet and smartwatch- sometimes all at the same time (but, if you can help it, I find charging gadgets one at a time gets the best results). If you're travelling or like to work away from your desk on occasion, this guide will help you pick the best laptop power bank for your needs based on our testing. We also include info on what different battery terms mean, note the latest info on flying with your bank and answer a few battery-related questions.