
ZENS' Apple Watch Power Bank is a compact Apple Watch charging solution that's one of the first to come with a built-in Apple Watch charging puck, eliminating the need for bulky, complicated cable winding systems used in other Apple Watch stands and docks.
Because the charging puck is included in the body of the Power Bank, it's one of the smallest Apple Watch charging options available, and with an included 1,300 mAh battery, it serves as the most portable Apple Watch charger available for travelers.

The Power Bank is cube shaped, measuring in at about an inch and a half wide and just over an inch tall. It's small enough to fit in jacket pocket (it'll fit in a pants pocket too, but the shape is bulky) and it doesn't take up a lot of room in a purse or a backpack.
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Article Link: Review: ZENS' Apple Watch Power Bank is Pocket-Sized and Ultra Portable Thanks to Built-In Charging Puck