I purchased this shaver due to the "good" rating by Stiftung Warentest. Now, after 2 years, the battery performance decreases but from increasing. And so as you can not operate on the razor network and there is no simple method to change the battery pack is in the foreseeable future a new purchase due, since the power hardly sufficient for a shave. Sure, you could have the research beforehand exactly but only the design idea that a machine inevitably degenerates within 2-3 years for electronic waste, I find totally unacceptable and would so never crossed my mind.