[xxXXxx-]

Batteries last a surprising long time on electric toothbrushes, mine claims it lasts two full weeks on a full charge. I've personally tested it successfully on a week and a half trip. You should have no problem bringing it camping provided your trip lasts less than a couple weeks. I never bring the charger with me when I go anywhere.

(My old electric toothbrush cost $10 about 10 years ago and used AA batteries instead of a wall charger. A couple AAs lasted quite a long time, probably close to 6 months, IIRC. So that one would last you the entire length of the appalachian trail.)

[kemitche]

Batteries also aren't a problem because if the battery dies you can still use it as manual toothbrush.

[xxXXxx-]

While technically true I have found it awfully awkward to brush manually with an electric toothbrush. I don't know if it's mental or the ergonomics are different.