"Having worked with batteries for years :i can tell you that not all cells or packs are equal"
I agree with you.
If there are two battery cells in the battery pack, one is 2200mah, and one is 1800mAh, then the battery pack's capacity is 1800mAh, my
dell inspiron 6000 battery broken when used for not very long, the repair man tell me that one battery cell work out, only one cell cause a replace of whole battery.