We used to bring these along when tent camping all the the time. The fans and Incandescent lights would really do a number on them over night.. I still got a couple of those YELLOW ones around here somewhere but they need new batteries in the thm... Never did open one up to order new batteries.
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Now that LED lights are on the sceen I bet they would last a long time...
They don't have a very big AH battery in them and will not hold a charge for a long time when you are using them...
Back in the camping days it was always a bag full of D-CELLS and some white gas for the stove and heater to use. All you needed haha...
Roy Ken