Here are a couple to get us started.
Power packs for all those portable lighting projects on bikes or costumes.
These will work for AA, AAA, C, and D batteries,they're 1 1/2 volts apiece.
This example is for AAs.
Get some 1/2" PVC.

AA batteries fit perfectly in this size PVC.

Calculate how much voltage you need and make the PVC long enough for the number of batteries needed.
Example: 12 volts takes 8 batteries.
Get a couple of PVC end caps, drill a small hole to feed a wire through.

Put a small loop of wire on the inside of the cap to make the connection to the battery, and a loop on the outside to connect to your project.
Cut the PVC to the right length, and when you put the caps on, the connection is made!
I'll call these "Battery Wands", and you can get the PVC that will fit whichever batteries you want to use.
There is a PVC made for hot water lines that is small enough for AAAs!

This next one is for lock hasps that you only have the bale for.
Get an eye screw and install it .

If it is screwed down far enough, it cannot be unscrewed when the bale and lock are in place.

I think this is actually stronger than the hasp that came with the bale!!!

OK, now it's your turn.