Homemade Battery Packs Are Inexpensive and Easy to Make
https://preparednessadvice.com/electron ... y-to-make/
A friend of mine made some battery boxes using 50 cal ammo cans and 12-volt burglar alarm batteries. They are very nice compact units that will provide 14 amp hours of power. I have built a couple of them and they work well. I have used them to power 12-volt lights, but they have many other potential uses.
What they consist off is .... CONTINUED at LINK, above ...