I use an electric toothbrush at home, so I also like to use one when I travel. I recently used this Philips One by Sonicare Battery Toothbrush when I was on a three-week trip. I charged it before I left home, and the charge lasted me for the entire trip. I used it night and day. When I used it at night, I sometimes used it manually because I was worried about the charge lasting my whole trip. I probably didn't need to worry because at the end of the three weeks, it was still going strong. amazontravel travelfind oralcare LTKHome LTKTravel