This Review Title is Great product! But leave the battery cap off between uses... and the content is: Sonicare are great products, as my dentist has noticed.<br /><br />The only problem with this great replaceable battery version is that the batteries didn't last for more than a week or two. Until I discovered that removing the battery cap between uses made the batteries last 2-3x as long.<br /><br />I can only guess that there is a small constant current drain on the batteries. Removing the cap disconnects them and stops that constant 24-hour-a-day drain. Then they last fine. I use NiMH rechargeables..There are other information for this review, one is This reviewer did purchase it and the other is 0 people think this review is helpful.