I don't know about batteries from Ryobi, but they have
FANTASTIC headphones (Home Depot sells them).
Heavy (blocks sounds, LOUD sounds even), and has female plug
where you can plug in wire to your mp3 device or radio or whatever.
Also, rather neat, this, has two wee microphones up at their
front, with a rotary off-on-volume switch -- when off, all you
hear is either quiet or your music or talk-radio or whatever.
When on, you can hear the guy who's trying to talk to you.
Pretty damn cool!
Somewheres around $60, $69, $49. Price changes for sales.