New battery recommendations?

[Ckrikos]

I buy my batteries for turbo and boxster from Sears. The batteries so far have lasted quite a while and are much cheaper than Porsche.

[Gelbster]

Need to use the correct part number or designation for this thread to be useful.You can get in a muddle without specific part numbers.Here is an example:
Which OEM size battery options are there? - 6SpeedOnline - Porsche Forum and Luxury Car Resource
It used to be simple - just use the familiar BCI chart to find dimensions/polarity and determine interchange. For example look at 94R here:
https://www.batteryweb.com/bci.cfm
Then came DIN and EN to complicate things with multiple numbers and letters for the same item !H7 and H6 in our case.
European Norm (EN) Battery Design - WORLD SOURCEONE®
And no, DIN doesn't always have an EN equivalent.
So you have to drill down into the BCI dimensions/specs to find the sizes that fit:
http://www.batterysales.com/downloads/battery-replacement-data-book-1994-2013.pdf
The short version is that the Boxsters from 1997 to 2005 take Type 48 BCI
Later Boxsters take 94R - see page 170 here :
https://parts.cat.com/wcs-static/pdfs/PEGP7801-06.pdf
If you want to fit a lighter+smaller Odyssey battery,they don't have dimensional equivalent to the BCI48 nor (4R,so you need the BCI dimensions & then look here:
Odyssey Battery - Wholesale Odyssey Batteries
PC1220 may be a good substitute?
http://www.odysseybatteries.com/batteries/pc1220.htm

[lkchris]

The Euro or DIN sizes are H6 and H7.

PET lists H6 for base and H7 for S.

H7 is 94R and H6 is 48, but these are obsolete and fast disappearing designations.

http://www.eastpennmanufacturing.com/wp-content/uploads/Deka-Exact-Fit-Flyer-0379.pdf

[Gelbster]

From Post 18
"H7 and H6 in our case"
Once you start with lightweight replacement projects,you need dimensions & placement of terminals info.The BCI charts are still the most helpful and accessible for this,perhaps because they are so familiar.
https://www.batteryweb.com/bci.cfm