stripped battery terminal and bad fuel filter

My 07 has not started in the morning about 5 times on me since October. I took it to the dealer and they found a stripped ground bolt on the battery. So all this time its been starting and running on only one battery, I bring it up because somewhere around here is a post on the same subject.

I left the dealers, got half way home and lost power, almost didn't make it back. Threw a code, ended up being a plugged fuel filter (now I have a extra one in the tool box).

I've been running 20% BioDiesel every other tank of so and it was 0 in michigan yesterday. I wonder if that was part of the problem? I had 7500 miles on the truck.