Yeah, I say buy it from Apple. If BTI's batteries had the same capacity for the same price, then buy from Apple. Seriously, Apple's 12" PB batter is 50 Watt-hours or something according to it's specs page. The BTI page states their battery at the equivalent of a 48.84 Watt-hour capacity, which is less. It isn't much less (4-5 minutes of battery life), but for the same price, get it from Apple.