Instruct: Classify Amazon reviews into positive or negative sentiment
Query: Battery loss

The moment I put this head on my Braun toothbrush I had the feeling there was more drag and I expected less battery life. The battery is dealing with a larger head (more friction) and a noticeably heavier head. I went from 6 days on a charge to 3 days. 3 days is the new norm. That's quite a bit more drag and a stiff penalty to pay for potentially improved cleaning.As some have pointed out, the head is larger. It is noticeable and you will need to decide if you like the lost agility and ability to navigate teeth better.In-so-far as the cleaning goes, I could not detect any difference. After using the head for 3 to 4 weeks I had to go to the dentist on another matter. I mentioned to him I had switched brush heads and had mixed feelings about the larger head. His view was to go back to the older head due to it's smaller size. The smaller head gets into areas a larger head cannot.I will go back to the traditional head.