I'm going to need a new battery for my 300TD soon; it's many years old and has gone dead a couple times lately - actually the alternator's fault, but I hear deep discharge isn't good for a battery. Since I'll be going on a long road trip this summer and I don't know how good/bad a shape my old one is in, I figure I might as well get a new battery to save myself potential trouble later.

So... what to get? From what I've found searching the board, something in the range of 850-and-up CCA is good. I also want a battery with a good RC (reserve capacity) because sometimes I do stupid things like leaving headlights on, etc., or while camping out in the back of the car I may want to plug in a laptop & cellphone for a few hours with the car off.

So where do I find such a battery? Looking around online, 850CCA+ batteries seem hard to find and almost nobody lists the RC for their batteries (grrr). Where do all of you get your batteries? (Am I just way too picky?)

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'81 300TD Wagon 355k (Miss Diesel)
'83 300SD 180k
'84 500SEL 190k (Parting it out)