The battery has subsided significantly with me already after 1 year: I must invite at least every 3 days (!)! Here I use the toothbrush alone, twice a day, that the battery lasts just another 8 - 10 min brushing time. A impudence the imprint "Made in Germany" can be Brown really give when cheap batteries from the Far East are installed without the ability to interchange when needed. Sustainability looks different! It was certainly my last electric toothbrush of this brand.