Coop in my opinion there is no bat warranty to cover anything under 50 degrees F. and we play a lot of games in the Midwest under 50 degrees! Most of our kids use composite and never break their bats and that includes using them in cages. The problem with cage balls is the old white dimpled balls were hard as rocks and that was an issue however most cages have went to a softer ball because it is cheaper. Our girls hit hard ball type balls and not the soft balls anyway in cages and vary the speeds 45, 55, 65 and move up after each pitch and then backwards. You may have seen this at the clinic unless you were back in the corner shooting craps or playing cards!
It if breaks get a Teflon scrubbing pad, liquid soap or soft scrub and clean it before you send it back.
You want a cheap bat to feel like your expensive bat? Take a 4 inch long piece of angle iron with you to Wall Mart with a tape measurer and your current bat. Lay the angle iron on the floor and find the balance point on your current bat and measure where it balances from to the bat head and then find another bat that weighs the same and has the same balance point. Change the grip (tennis grips are cheaper and have more cushion) to what ever she currently uses and it will feel pretty much the same...may not perform exactly like the $300 dollar one however she could hit home runs with a $60 bat from Wall Mart. It only has to go a max of 225 feet in the ISF anyway. As CB said, "It is cool dude when you can put it in the trees or parking lot however it was a home run at 225 feet!"