Just want to get this info into the 996 and 997 forums. Am using this old thread because I got much of my information from it.

Summary
FYI, I am putting my 3rd different size battery in my 05 996. The smallest, the 48/H6 lasted over 5 years despite being under the OEM CCA and frequently being stored in a discharged condition

Looking at conventional batteries, I noticed that Pepboys has the most expensive AGM and least expensive non-agm. Further, the biggest H8 cost the same as the smaller H6. What does that prove about the cost of lead/antimony and plastic and how marketing determines purchase price? I had to manipulate the website to allow me to buy the size of my choice by putting 3 different cars in my virtual garage on the site.

2000 911 H6 (48) Bosch Premium * 40 lbs 760 CCA $140 OE CCA: 650
2005 911 H7 (94R) Bosch Platimum AGM 47 lbs 800 CCA $200 OE CCA: 740
2010 911 H8 (49) Bosch Platimum AGM 52 lbs 850 CCA $200 OE CCA: 740

2000 911 H6 (48) Bosch Premium * 39 lbs 690 CCA $114 OE CCA: 650
2005 911 H7 (94R) not available
2010 911 H8 (49) Bosch Premium 45 lbs 850 CCA $114 OE CCA: 740
* adding to the confusion the site lists two batteries with the same label with different cases and product numbers

So I got the H8 Bosch Premium, Lowest price, highest CCA, Medium weight

FYI 15% off $100 online purchase (code SPEED15), in January (sorry for the late notice)
10% off Bosch batteries, online (code BOSCH10)