Ebay offers Rocketfish Extended Play Battery Pack For Nintendo Switch for $20 (reg $49.99) with free shipping.

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Product Description:
Enjoy more gaming time on the go with this 5000 mAh Rocketfish Extended Play Battery Pack for the Nintendo Switch. The USB Type-C port lets you charge your console while gaming and the built-in stand offers hands-free operation. This Rocketfish Extended Play Battery Pack has battery level indicators to display the charge status and air vents help increase heat dissipation. Double the fun without being hooked up to a wall travel with confidence knowing you wont run out of juice