I have bought a truck with camper shell and now beginning to make it travel ready. With retirement coming up in a few years I plan to be on the road more than at home. My question is the need for energy to operate the many items needed will be much more than the truck battery is able to handle....
What is the smallest battery source that i can use to support a device much like an old beeper and a green LED. The beeper only works once or twice per year 4 times at the most, the green LED will be used fulltime. The battery source can not be rechargeable, and cheaper is better.