nope you are not wrong I got such battery for a 2.7L SUV, in 2011 after 10 months it started showing problem for cold start later it died, replaced with a regular AGS battery prepared under methodology by xulfiqar in batteries section now it is apprx 21 months old and cranked the same engine like ' half kick ' through out the winters.
I read through the pages and understood it is all about charging voltage in Japanese cars & local UPS units.