Knog lights - kill them in the wet

I prefer lights that only have a simple on an off switch, they tend to cane batteries but they never fuck up and are easily rebuildable. i.e.

one of these

I have to sand down the contacts to get maximum battery life outta them, and they don't look exactly pretty, but they don't break.

I used to have one of them. It broke (after about 10 years).