This project is only to give you a new idea. I upload such projects from time to time, because i know that sharing simple solutions and ideas is more useful than sharing a complete and complex project.

The problem that i had, is that i wanted a battery holder that will hold 4 AA batteries in one series. I will use this pack for my door key-code lock project. I need to have 4 batteries inside the door, so space is critical. I cannot have the typical 4-pack battery holder, because it is too thick to fit inside the door. So this is what i've done:

I have better liked to use a plastic tube, like the conduit used for the external electrical installations in factories, but I did not currently have one with the proper diameter. So, i used corrugated cardboard instead:

Thick corrugated cardboard, packing tape and scissors	I put the 4 batteries in series	And rolled them to make a tube.

I need 2 different power outlets, one for full 6 volts (4 x 1.5) and one for 3 volts (2 x 1.5). Here is how i connected the wires onto the batteries:

I will use an old fuse which has the same diameter like the batteries	I removed the metallic ends form the fuse	On the first, i soldered a spring and the black wire
And on the other, i soldered again a spring and the red (6v) wire	I soldered the third yellow wire (3v) in the middle of another spring	These are the 3 wires

Finally, i put it all together:

First the black wire. I pushed it in the tube	Then, i pushed the first 2 batteries	Then, i put the yellow wire between the 2nd and 3rd battery	Finally, i pushed the red wire in the tube (the spring is missing :D )

I put some packing tape to secure the two metallic ends firmly in place. This is the result:

As you understand, this battery holder is not ideal for replacing the batteries often. But i do not intend to do so. If you want to make it more flexible and easier to change batteries, i strongly suggest you use a plastic tube with threaded ends and threaded covers.

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