Normally I use them without ANC. No problem with fast battery drainage. Can use them at least 6 hours without putting them in the case. About 3 to 10% higher drainage of right earbud. Bluetooth works very well even for long distances, that is my house. I am a very satisfied owner. Fantastic earbuds.
Expert Pro 220. Dynaudio C1 II. Rega P8. Lyra Delos. Primare BD 32.