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The launch of the much-anticipated Apple Watch had a noisy audience on their feet on Tuesday.

But despite the range of impressive features unveiled by Tim Cook, there was something he failed to mention: battery life.

The telling omission, suggests the Watch's battery life will be the Achilles Heel of the device when it sold in early 2015.

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The launch of the much-anticipated Apple Watch had the audience on their feet on Tuesday. Despite the range of impressive features unveiled by Tim Cook (pictured), there something he failed to mention: battery life

Most existing smartwatches on the market, such as Pebble and MetaWatch, tend to last up to a week on a single charge.

The closest Cook came to talking about the battery life for the Watch was saying that users would 'charge it at night.'

The company's chief executive added that the Apple Watch 'can be worn all day, for any occasion,' but hourly figures were notably absent.

A source said that Apple is unhappy with the watch's battery life, according to Re/Code. Another source confirmed to the technology site that that the battery life 'is about a day now.'

Apple did, however, spend some time talking about the Watch's charging system, which combines Apple's MagSafe technology with inductive charging

The watch has a completely new user interface (left), different from the iPhone, and the 'crown' on the Apple Watch is a dial called the 'digital crown' (right) presented by CEO Tim Cook

The company's chief executive added that the Apple Watch 'can be worn all day, for any occasion,' but hourly figures were notably absent. The product costs $349 (£216) and will be sold early next year

MailOnline has contacted Apple to find out exactly how long the Watch's battery will last, but the company has yet to respond.

Like many of Apple's other products, the Apple Watch appears to have a sealed back, which means the battery cannot be replaced. 

This suggests that the entire $349 (£216) device will have to be replaced, once the battery eventually deteriorates from constant charging and use.

Another concern is launch of the health and activity-tracking apps on the Apple Watch, which will rely on adequate battery life for round-the-clock monitoring. 

Apple unveils its long-anticipated Apple Watch

Built-in is a 'taptic engine' that responds to a vibrations users feel on their wrist . It understands questions in messages and then offers pre-selected answers, and messages can be dictated to the iPhone

If the Watch has to be charged at night, vital health signs could be missed by the gadget which Apple says will 'motivate people to be more active and more healthy'

Companies like Fitbit and Withings have health trackers that are designed to be worn at night too, monitoring sleep patterns through movements.

However, if the Watch has to be charged at night, vital health signs could be missed by the gadget which Apple says will 'motivate people to be more active and more healthy.'

Apple did, however, spend some time talking about the Watch's charging system, which combines Apple's MagSafe technology with inductive charging.

The long lead time before the product ships could mean the device will be more functional once it's released, since app developers have more time to create apps specifically for the watch.

Apple's silence on battery life suggests the company is still working to improve the feature. The success of the device could hang on whether or not it manages to do it in time.