The new MacBook Pros have one big question mark: battery life

Apple's new MacBook Pros are here, and they may actually live up to the Pro" moniker. But there's one big question that comes with the new sizes and processors: how's the battery life? To hear Apple tell it, it's going to be great - the company even said onstage that the 16-inch had the best battery life ever, besting last year's M1 Macs (which it also boasted would have the longest-lived batteries). But the metric Apple used to back up that claim is a bit suspect, and its other numbers tell a very different story.
In its keynote and press release, Apple says the 14-inch MacBook Pro will provide 17 hours of video playback and estimates that the 16-inch model can last for an unprecedented-for-Macs 21 hours. But using video playback as a...