Apple may already have a fix for one of the biggest complaints about the Apple Watch - battery life

There's been some concern as to how long the Apple Watch's battery will last, but the company may have a way to fix that - or at least help it.

The Apple Watch will reportedly come with a feature called Power Reserve, which hasn't been announced yet, according to The New York Times' Brian X Chen.

The feature enables the watch to run on low energy while displaying only the time.

The Apple Watch is estimated to last about a day, according to the Times. Battery life has been a hurdle other smartwatch makers have had to overcome too - when the Moto 360 launched, for example, critics slammed it for its short battery life (Motorola has improved battery life through a software update since).

If Chen's report is true, it sounds like it could be a potential lifesaver for the Apple Watch. If the Apple Watch's most important feature is telling the time just like Apple says it is, the watch needs to be able to do that whenever possible. Without that functionality, you're left with a powerless black screen strapped to your wrist.

We expect to learn more about the Apple Watch at Apple's upcoming event on March 9.