I reckon if you changed the battery posts in the 501x to something like the B44/BJ4 ones you would get them in fine. The ones in the 501x are quite fat at the bottom so the packs wont go in.
With the 3200's you could use the AE thumbscrews to hold them down and make it a bit quicker to remove. The 4800's could be put in with simply using longer screws.
Thats what i did with my BJ4 and a 4800 pack, just removed the plastic battery trays and use the lipo locators that schumacher do (£3 carbon strips!) to stop them from sliding out sideways, and used longer bolts with the straps. Works a treat so far.
I'll try and get some pics tonight of my BJ4 install
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