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Here are 9 must-have Apple Watch apps

Remote Battery app for Apple Watch

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Remote Battery

The Apple Watch, as has been heavily reported, works in conjunction with your iPhone. So if your iPhone's battery dies, you could be in a pickle. Remote Battery keeps an eye on your phone's remaining charge, letting you monitor that data from your wrist. It will also send an alert if the charge drops beyond a certain level, giving you ample time to find a power source.

Source: Remote Battery