Don't let the zombie apocalypse or a power outage leave you in the dark. It's easier than you might think to keep your flashlight and other battery-operated devices running even without the proper number of batteries.
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Step 2: What you'll need
This is a fairly simple instructional with minimal material requirements. After all it is for emergencies.
All you'll need is the device you'd like to power, at least one battery and some aluminum foil.
Step 3: Aluminum foil
First you'll need to tear yourself a sheet of aluminum foil. For a flashlight that uses D batteries I got a piece about sixteen inches long.The amount of foil used doesn't have to be exact; just get as close as you can. This emergency technique will work with other battery sizes, but the amount of foil used may differ. Once you understand how it's done you'll be able to easily figure it out on your own.
Step 4: Folding the foil
Fold your foil sheet in half the long way. Smooth it out and then fold it the long way a second time. Don't worry about super clean, smooth folds. A good-looking sheet of foil isn't necessary, and in an emergency it's unlikely you'll be taking your time.
Step 5: Size
The beauty here is that nothing needs to be exact for this to work, just close. After the folding is complete you should have a long strip of foil that is slightly taller than the battery you are using.
Step 6: Roll a foil tube
Now It's time to roll! Just pick an end and roll your foil strip into a tube. No need to have your tube be the exact girth of the battery, just make sure it's not too thick to fit into the flashlight and you should be good to go. You can see in the last picture that mine was a fair bit thiner and taller than the actual battery but it still worked perfectly.