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There’s no shortage of portable batteries on the market, but how many can fit in your wallet? The LithiumCard Wallet Battery can, and is still capable of rapidly charging your phone despite its size. For a limited time, you can grab one for only $20.

No thicker than 5 credit cards, the LithiumCard Wallet Battery is fashioned from sleek and durable aluminum. Its thin size makes it easy to bring anywhere, and it can charge your phone at 1% battery a minute. Plus, this battery comes with a built-in connector available in Lightning and Micro USB options.

The LithiumCard Wallet Battery normally sells for $59.99, but BGR readers can take over 60% off, making its final price only $20.