has anyone had any luck with cheaper 3rd party macbook pro batteries? im trying to buy a new one for a 15in macbook pro (model a1211). amazon has a few for around $25 and ebay does as well. both places seem to have very mixed reviews. Even if there are 20 great reviews there are usually almost the same amount of awful reviews. im at the point where my battery is telling me its charged but if i unplug the magsafe the lap top dies in 1minute and a lose all of my unsaved work. i've tried pulling out the battery and holding down the power button to reset it with no luck. thanks!