Apple is hopeful that the watch can run for 19 hours, combining active and passive use, the report said.

According to other reports, Apple Watch can last through two to three days in standby and low-power modes.

However, if the watch is used strictly as a timepiece and the screen is on at all times, then the battery will die out after three hours or so.

The CPU inside the watch is more or less equally as powerful as the A5 chip that powered the iPhone 4S and iPad 2, and remains in the current-generation iPod touch, the report stated.