the main thing I just try to caution people on is to not put these kind of tools away in a kit and expect them to work perfect 5 years later. The batteries will porbbaly eb bayond recovery from just sitting by then.
It just seems to me everyone is jumping on this crank fad so they don't have to worry about batteries but they still do. My suggestion is to buy a decent battery charger, decent batteries and tools/gear that use those batteries then check your gear at least twice a year or once a season change.
You should be checking your gear every so often anyway to rotate water and food and replace expired medication and supplies so its not any more effort to rotate out some primary batteries or top off some low self discharge NiMH's.
Rememeber also that a lot of the crank stuff uses NiCad batteries so don't toss them in the trash when they die, take them someplace to recycle the NiCad's properly.
Its a preference of mine to have things serviceable, I want electronics powered by AA batteries so I can re-charge them every few months then roatate them out in a few years. I have gear that last ten years or more that way.