If you do a lot of outdoor work or play in foul weather, you've probably noticed that keeping your batteries dry can be a bit of a hassle - they are metal so they attract condensation. And you've probably also noticed the considerable importance of keeping them dry. Not only will a wet battery rust rapidly, the water can create a conductive path around the top of the battery which rapidly discharges it - leading to a nasty surprise if you are counting on your gps or flashlight! I've also discovered that even if i keep my spares in a ziploc bag, some of my "waterproof" electronics (like my gps) are actually waterproof on the inside, but not the battery compartment - so while the gps electronics are happy and dry, the batteries powering it are sitting out in the damp cold still!
so, for a while now i've been waterproofing my batteries. its incredibly easy! so easy in fact that i really wonder why some of the manufacturers don't do it already.
This project is brought to you by MonkeyLectric and the Monkey Light bike light
(which now includes a 100% waterproof battery holder so this tip isn't needed)