If you're interested in the EO V7110 and its extended battery you'd better look at his report. I think the photos and the commentary are worth considering as Frank (aka: CTitanic) goes through it in detail.
Let me start saying that I consider the eo Extended Battery (6 cells) a must have. The original battery does not have enough juice to convert the eo v7110 into a real Ultra "Mobile" PC, no even to watch the majority of the movies in the market. The 6 cells battery has enough power to watch King Kong.