Here is another portable Apple Watch charger that lets you get more out of your smartwatch. The Firenew Apple Watch Charger comes with a 700 mAh battery. It has 4 LEDs to show you the battery status. The device fits on your key chain, so you can take it with you everywhere you go.
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This charger is compatible with all generations of Apple watches. It costs under $40 at this time.
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