When I was working on my foglights yesterday, I disconnected the battery. I noticed that there was a bunch of blue powder around the connecter nodes.

 

cool

 

Clean the terminals with BakingSoda and water, and spay some terminal protectent on it.

 

any idea what this crap was?

 

It's Oxidation or in leahmans terms it's your battery terminal being eating away with corrosion. Go to a local parts store and buy terminal spray. Most are Yellow or Red and will stop the corrosion. Apparently yours is bad so you should do it every couple months just re-applying the spray to keep the corrosion from destroying your Terminal ends

 

You can always get an optima gel cell (red or yellow top) and yoj wont have that problem