no li ion battery and not waterproof [SEP] wow it is and this thing comes with nimh batteries instead of li ion how did i miss that it is my bad of course claims days of charge it is also not very happy getting wet it seems do not use while bathing that is one of my favorite things to do with my sonicare i love the looks of this thing and was willing to pay the price but no li ion and not being able to use it in the shower wow and replacement heads are for i am so eager for someone to make a usb chargeable electric toothbrush that is well thought out