I have done the short press of power button while in RTH, with no change, but have not tried for low battery alarm. If RTH is short pressed, it will cancel RTHI may be wrong about this, and I just can't find the reference - so try it and see ... I think you can just do a fast click of the controller on/off button and it will silence the audible alarms.
Apologies in advance if that doesn't work - but it won't turn off your controller - unless you do the short-press / long-press thing.
Here's a 3rd party product that can be used to edit the controller and stop the warnings ...
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