Thread: 300 Tdi won't start...just out of the blue!

Originally Posted by Young Angus

Well there you go I just learned what a deep cycle battery is for the first time...there seem to be a few different Optima batteries, is the D34M just the one that fits in the Disco? Are the blue ones the best out of that range...they kind of all sound like they are very similar between the blue, yellow and red ones on the website...?

I agree Frank, I'd much rather just have a top of the range battery that I know won't let me down. The starter that's in there is actually a 600CCA while the secondary one is 525CCA. Took it for another drive last night and it again started with no hassles at all so all is okay for now but I'd still like a replacement because the little window on the top of the battery is black...unless it's a very VERY dark green.

The secondary batter is a Super Charge.

Don't why I said M, D34 yellow is the best bet.