Uber, the app-based transportation service which lets you request a ride from your iPhone, is running a pretty interesting promotion in Phoenix, Arizona starting today through Saturday for Super Bowl XLIX . Between 10 am and 6 pm each day, Uber will offer to deliver a free Mophie Power Reserve ($49.95 1350mAh battery charger) to its users through the app. The free Mophie option is listed alongside car types in the Uber app.

Since requesting Uber to deliver a mobile charger to you then having them wait for you to charge your phone would take potentially hours, Uber and Mophie are giving the Power Reserves away to keep.

In the past, Uber has ran similar short run promotions with ice cream and other offers. In DC, for example, Uber is currently promoting a puppy adoption drive.

As for the Mophie giveaway promotion, Uber says it expects demand to be high, obviously, so you’ll have to test your luck with picking up a free Power Reserve if you’re in the area. Uber says its cars are equipped with Mophies, too, if you’re taking a ride and just need a quick charge.

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The promotion is available in Downtown Phoenix, North Scottsdale, and Old Town Scottsdale in Arizona ahead of the Super Bowl hosted there on Sunday. (Here’s how to follow along from your iPhone, iPad, or Mac if you won’t be there.)

You can download Uber for iPhone for free on the App Store, and if you’ve got an iPhone 6 or iPhone 6 Plus, you can even pay for your transportation using Apple Pay.

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