I've noticed my reach 360 controllers have cracked around the battery compartments this has been caused by a black play and charge kit battery I purchased when I got the reach bundle the very nature of the cracks implies force being put upon the lower lip
of the battery compartment causing them to crack.
I already know there is only a 90 day warranty but I felt I should come here with pictures and try my luck though I'm likely already screwed.
controller with no battery
I have 2 controllers from the bundle the one i've shown is the worst when it comes to the cracks the other being used less doesn't have nearly as big of a crack.