While it’s already been shown that replacing the battery on an older iPhone speeds it up — and Apple has already admitted that they slowed the older devices on purpose when the batteries weakened — a new video is showing just how pronounced the benefits are. The video, posted by Bennett Sorbo, showed a slowed-down iPhone 6s completing a series of tasks in 5 minutes and 45 seconds, then showed the same device taking only 4 minutes and 33…