Similar issue... after full charging Series 7 quits after few seconds w/blinking red light > removed and tested battery and it reads good... Battery has never been replaced and I'm thinking that's the issue no matter what the tester says... plenty of YouTube's on how to perform task... battery on Amazon... will post update if I R&R battery Update (04/12/24): Way Too Late Update: I ended up replacing the battery and the shaver worked... briefly. Soooo, I swapped the motor / guts of the shaver with another one and it worked until ..... it didn't in March '24. Now out of options unless I want to roll the dice on buying a new motor but I'm tired of fixing this appliance.... and they aren't really waterproof either. Everyone I've taken apart shows corrosion inside. At this point I've bought a Harry's razor and shaving gel! After 25 years of my Braun I'd forgotten how well a real blade shaves. See no reason to spend a couple hundy+ on a new electric razor... at least for the foreseeable future.