Thats really good post, but what i do is this:
1. Use the Battery to the full extend
2. Change the battery on the fly.(without restarting the phone)
3. Process takes exactly 7 seconds or even less.

I have 3 nokia batteries 1 original and 2 from ebay. The other 2 gave me almost equal capacity as the original.

I need to know how to check the exact 'mAh' the other two are giving.

Thanks.