I find this single-sided ANR headset to be perfect for the Airbus right seat given few CAs use a headset. I can hear ATC clearly and it might save some hearing in one ear. I use the ear plug foamy underneath, adjust volume as needed, and wear it all flight long instead depending on the speaker. It's comfortable. No battery needed.

Telex Airman 850 ANR Single Sided Aviation Headset - Marv Golden Pilot Supplies

https://www.amazon.com/dp/B008MCU0N0..._t1_B0006GWRY0