Not sure what they can do about it ... all devices with Lithium Ion batteries are subject to this occasionally.
I had it happen with an iPhone and even a laptop - took 'em in and they replaced 'em.
Manufacturers put batteries in devices and sometimes they expand. If it cracks the glass you don't continue to use the device - you take it in or call for service. At least the battery case contained the contents and the battery didn't explode or catch fire.