I took my 2000 PSD in for a service to the dealer the other day and when i went to pick it up they told me the batteries were a little weak, and that they may cause me to have some problems starting in the cold weather in the near future. Those batteries are only a year or year and half old! I was wondering what the best way to test those batteries is myself? I dont trust the dealer for nothin! And another thing is if I do discover my batteries are a lil weak, what is the best kind of battery i could buy is? Which one will last the longest and provide the most power that i need to start my truck the best? Thanks for any info guys! Bret