This has only recently started happening (as far as I know). Basically, only after turning my MacBook Pro on, I normally always look at the battery percentage, and twice, including just now, it'll say something like 50% or so, and then after a couple of minuets it just turns off.... As if I've let the battery run out... I have to plug my charger in and wait about 10 minuets for it to charge up and turn back on... Now it's alarming, because this has only happened previously when I've seen the battery percentage on red and something below 5%, and forgot to charge it and its just konked out, as expected. But recently, a couple of times it has just turned off, when I have blatantly seen that it has about 60% or something... Is this a known issue where MacBook Pros show that there is a certain percent of battery when there is indeed only a small % and just about to die? I'm sure as well that when this happens, it seems to take a much longer amount of time to actually charge back up and turn on... Hope someone can shed some light, thank you.