eats batteries [SEP] save money in the long run by buying a model with a chargermy husband and i have had these brushes for about a year and a half and are down to replacing the batteries about once a weekmine died within a couple months of use it would just keep shutting off during use even though the batteries were new i called sonicare they had me take it apart and clean the contacts with rubbing alcohol that did not help so they sent a replacement the new one started doing the same thing within a few weeks called again again they sent a replacement their customer service is actually pretty good and they stand behind their products but it gets old replacing batteries and replacing brushesoverall i like the performance of the brush it does a great job and my teeth really do feel much cleaneri just ordered a set of two with chargers from amazon they are more initially but i know we will save money in the long run by not having to use aa batteries every week