Ask Engadget: How do I keep my electronics from dying when I travel?

The three important features to look for when picking a portable charger to take on your travels are its capacity, weight and connections.

TSA and FAA rules say that all spare batteries, including power banks, can only go in your carry-on luggage, not your checked bags.

There’s no limit on the number of batteries you can carry, but they should be for your personal use.

This is the ideal bank to stash in a day pack before you go wandering around a new city.

It has two built-in USB-C cables, one that retracts into the body of the bank and extends a generous two feet , and one that loops to create a handy carrying strap.

Nimble is certified as both a B Corp and a Climate Neutral organization, too — a rarity in the tech world.

Three USB-C ports and one Type-A port should cover your phone, computer, watch and tablet, so you can get the most out of sometimes-scarce hotel wall outlets.

The more you plug in, the less charge goes to each device so it’ll take longer for everything to get to 100 percent .