It is a simple matter to make battery packs for small appliances. Commercially made battery packs are expensive and do not do any better of a job than homemade ones.
Small cylindrical batteries, such as C, D, AA and AAA can be made into battery packs simply by purchasing the pre-made battery fixture. Here is a picture of a four battery pack from Radio Shack. It holds four AA batteries. The wires are connected to a 12 V style car connector, positive in the center. This gives 6 V with regular batteries and 5.5 V with rechargables. The top pack is empty. The bottom one is filled with batteries.
Here is a picture of a battery pack made from four 7.5 amp/hour sealed lead acid batteries. This gives a total of 30 amp/hours. That is a substantial amount of storage. It is equivalent to a small car battery. These batteries are taped together with wide foam, two sided tape. This tape is strong and essentially makes them into one battery. The wiring harness hooks all the negative (-) poles together and all the positive (+) poles together. This harness goes to a set of two wires that go to the car style 12 V connector. The center conductor of the jack is positive (+). Make certain that the wiring is heavy enough to handle the current the pack can deliver. This pack is technically a battery bank. The blue strap around the battery pack serves to add a little strength and as a carrying strap.
These homemade battery packs can save you some money and provide you with easily constructed portable power.
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