And, to clarify, the mechanical tension on the larger battery is no different than the small (original) battery. The geometry of the latch is the same in both cases. I've tried hard on multiple units to intentionally break the latch by pressing down on it with no luck. There might just be some units out there with some variance in the plastic that makes them more susceptible to breaking, but we've not actually been able to confirm that on any unit we've checked (many).
Of the thousands of units we've sold, looks like fewer than a dozen reports of this actually happening, with many more paranoid that it might happen to them, too.