You forgot camera and computer. Many digital cameras run on AA batteries so purchasing replacements should be relatively easy to do. Computers, like most smartphones, don't run on AA or AAA batteries (some old netbooks or the like might but not current ones).

What do you define as long distance? A cross-country (such as USA or Canada) trip might not be much of an issue because a wall socket for a charger should be relatively easy to find (unless you're doing the Continental Divide). A world trip could be an issue because of different plugs.