I'm looking online at the 2600mah battery, but cannot find the thickness dimension. The 3500mah batteries for the i400 galaxy S on Ebay are 10mm thick, and I know the normal and 2600mah batteries for the two are the same. So I am wondering if the 2600mah is the same thickness or not as it wouldn't make sense to buy the 3500mah batteries if they won't fit the extended cover for the Charge.