ORIGINAL: flyinwalenda
The "C" rating of Lithium packs is the maximum current that can safely be drawn from the pack without damage to the pack. You multiply the milliamp rating by the "C" rating to obtain the max amp number. Typically with analog servos you can get away with less amperage than digital servos as the digitals tend to demand more current.
Thanks for the info. I have another plane with 5 645's in it. So it's safe to say that I could use the 1900mah 3c in it.. How many flights do you think I could get out of one charge? Sport flying...