I figured that might be what you were doing
I was out in BC spring 2013 flying a DLG contest, and with all the border crossings there it seemed like it was SOP for those guys as well.
We can do the same thing, but Buffalo/Niagara Falls is about 3 hours round trip, not including the time to get across the border.
I dohave a combat flyer in MI that will hold stuff for me, but then I won't get the batteries till next spring.
Of course I won't need them till then, so that might be the best plan.....
Pat MacKenzie