That's a good point...nothing was more disappointing than taking my brand new grill propane tank in for a refill and getting an old painted over rusty tank as an exchange...
LOL
I NEVER GOT ON THOSE PROPANE EXCHANGE PROGRAMS. I USED TO BRING MY TANK TO A REFILLING STATION
IN ADDITION, OLDER BATTERIES MAY NOT HAVE THE DRIVING RANGE AS NEWER ONES.