A number of alleged Apple Watch details have leaked in the past few days leading up to today’s Apple event. Sources who have used the Apple Watch say the device’s battery will be able to handle 5 hours of “fairly heavy application use,” besting an earlier estimate of 2.5 to 4 hours, according to 9to5Mac. Meanwhile, TechCrunch is reporting it will take the watch about 2 hours to charge fully. Other tidbits from the 9to5Mac piece…