Do sennheiser tr120 wireless headphone rechargeable batteries ever need changing

I used an 1/8 inch male plug into tv and then into headphone xmtr.
amazon has lall cables and adapters.

here is link to instructions
copy and paste

https://fccid.io/ANATEL/00916-12-07356/Manual/43CEE361-CE0E-4C13-998C-DDDC6A4E2E2C
https://en-au.sennheiser.com/how-do-i-set-up-the-rs-120-wireless-headphones
https://www.youtube.com/watch?v=IkEGgXD__NI

Probably need new batteries.

Rechargeable Batteries are notorious for failure, if they are accessible they can be changed to new... hope this helps?

The headphones will automatically charge wirelessly when placed in the cradle that should have come with the package. To make sure the headphones are placed correctly, a red light should illuminate letting you know they are being charged and are properly placed.

They specify 2 x AAA size Ni-MH rechargeable battery, 1.2 V

http://www.retrevo.com/support/Sennheiser-RS130-Headphones-manual/id/7196ag815/t/2/

It should run with standard batteries but don't place it in the charger with them installed.

Couple of things could be going on..

Try the obvious first

1. Select a different channel on the base unit: Located on the front, under the logo is a small switch. Note the position and try the other two settings
2. Make sure your base unit is not next to other items that may interfere with it.. cordless phones and wireless network routers etc.. microwaves or other RF sources .. fluorescent lamps.. etc

Lastly.. just about all wireless headphones have some noise or background hiss.. but it should be minor.. if the rechargeable batteries are not taking a full charge or cannot retain the charge properly.. the reception will also weaken.. and that noise will increase.. and the reception distance will decrease.

You can buy a new set of rechargeable batteries .. just make sure they are exactly like those in your headphones..

If I remember right.. they are Nickel Metal Hydride… (NiMH).. Radio Shack will have them.. or a store like Batteries Plus.. If you replace them.. go for a slightly beefier battery.. a higher mA-h.. may take a bit longer to charge initially.. (If you try this.. remember.. they will need to charge overnight before use) but will “play” longer in use.

It has been noted that many of these headphones shipped with inferior batteries.. that problems seems to have been addressed by the mfg.

Good Luck!

did you try to put regular batteries in to see if that works?

Replace the NiMh batteries. They might be bad. Could happen during power surges as you indicated you had. Let them charge up fully 14-18 hours as the book suggests.