Mechanic thinks it's the ima battery with the auto stop causing the vibration making it kick hard enough to break it.
Mechanic is incorrect....the engine idling at a stop light (like every other non-hybrid car on the road) instead of shutting off the engine at the stop, can't break mounts.....
I don't hear anybody else complaining about breaking mounts......
Even if the idle stop were still working with a good IMA battery, it's no more stressful on the mounts than a normal startup and gear engagement and takeoff.
Is there anything else that could cause so many motor mounts to break?
I think the problem is the aftermarket mounts.
What caused the original factory mounts to go bad? Were they ALL bad?
I'd probably want to do a little checking on the car just to make sure it hasn't been crashed and somehow has the subframe/body tweaked wrong in relation to the drivetrain mounts (causing misalignment or binding, unusual stress on the mounts)
Assuming the above is all okay.....
Put a set of factory Honda mounts in there and I bet your broken mount problems will be gone (until those wear out).
Not as cheap as aftermarket....and that's probably why the aftermarket parts got installed in the first place. Right?
Also note, high heat areas (desert SW?) can cause rubber parts (bushings, etc.) to wear out quicker than cold climates. I was amazed the first time I ever saw underneath a car from the desert LOL.