Replacing the OEM Battery in our 150's Prado with a Optima Yellowtop?

Hi all,

Our Factory OEM battery under the bonnet is starting to show the ever so slight signs that it's starting to get weak, so with us heading up to the cape this year, I was thinking of replacing it with the Optima YellowTop D27F (66Ahr & 309mm in length) or the D31A (75Ahr & 326mm in length).

I have a Optima D34 (55Ahr) as my AUX battery. This was chosen due to ease & quickness of charge and the allowable Depth of Discharge too, along with a lighter weight when compared to the heavy DC batteries. I also wanted to protect my inner guards from any cracking if possible.

What are people's experiences with these Optima Batteries, etc ??

RobM