That is untrue Highlander. The phone does not care what battery is in the phone (ALL cell phone batteries are the same voltage, so only the capacity differs), all you need to do is fully charge (FULLY, keep it charging at 100 for at least 6-12 hours to make sure), then unplug, boot recovery, wipe battery stats, then use until it shuts off. The phone will calibrate itself. And really you dont even need to do this, as the phone will do it on its own just slower since it doesnt have a base line to compare it to. Its like when you install an aftermarket performance part in a car with an ECU. The new part changes parameters of how the engine runs, and until it fully adapts, you wont get optimal performance out of it. And you can speed this process up a little bit by disconnecting the battery and letting the ECUs memory wipe so it has a fresh start. Its not averaging out the new parameters from the new parts with the old parameters from the old parts, it just starts to figure out the new ones.
As for the batteries, unfortunately I already ordered the 1900mah (off Ebay) before I saw the 2450mah (oh well it was only $6 for one). So depending on the performance I get from this one, I may or may not order the larger one. And I will perform full reviews on whichever ones I get. Until then though, why NOT order one of them, their only 6-12$??