A question about the warranty and the extension to five years: are damaged batteries and loss of performance covered? Does the warranty also cover the replacement device? I ask because I have already bought a Sonicare DiamondClean three times (!) + received a replacement unit. And four times, more or less after the warranty expired, either the battery or the brush head was defective (as soon as the brush touches the teeth, it hardly moves... even a manual toothbrush is more effective then). If the toothbrush works perfectly, it is worth the money. But the fact that it doesn't even last 1-2 years without problems at a price of 165 - 200 CHF is actually almost bordering on fraud. And it's a little hard for me to believe that I've simply had bad luck four times. That's why I'd like to know if the two problems I mentioned, which apparently don't just happen to me on a regular basis, are covered by the extended warranty and if I don't have to worry about something like this happening again for five years?