Easymoney you sure about that? I had the non battery variant and tried out a battery version and they were much much quieter.
Apparently the option to have power to the headset jack is an option that RYR didn't tick when ordering from Mr Boeing.
I have the battery powered version and if you get yourself two or three sets or rechargeables you'll always be covered. Bit annoying though when they die on short final and your world suddenly becomes noisy!