The Apple Watch is one of the most popular smartwatches around. The battery life is not that great though. The WiPowerBand is a battery extender for the Apple Watch. It has a compact battery and wireless power transmitter built into a unit that fits under the watch to double its battery life. You can charge your WiPowerBand using the Apple Lightning power cable.
The wiPowerBand is available in 38 and 42 mm sizes. It is created from high density polymer and comes in multiple colors. Sets you back as low as $89.