I havent charged them but once since I got them (about 2 weeks ago). Update:Der Betrieb ist nach ein par Wochen etwas "fluider" geworden. Two years ago I had a complete spinal reconstruction surgery due to severe scoliosis. The photo appears red, but theyre more fluorescent IRL. My twin kindergarteners do distance learning at the same time and they both like to use headphone/mic (gamer) headsets. So, I took the replacement power adapter in to use on my 8220 at work, and it’s fine (must be better power conditioning there). I’m wearing it now. No time to send back for another size so I made them work. I am happy with the build quality and I DID get these for $11. I write very few reviews on products.