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A low-battery warning popping up on your phone can be pretty inconvenient, especially if you won’t be near an outlet soon. But if you have Powrtabs Disposable Battery Chargers, you won’t have to worry. They’re just $19.99.

External batteries can be helpful, but those can run out of juice, too, especially if you forgot to give it a charge. That’s where Powrtabs come in handy. Powrtabs are extremely portable, disposable little batteries that will give your devices the boost they need. Even better, they’re made out of completely recyclable materials — non-toxic and eco-friendly.

Going camping? Headed to a concert? Bring these along, and your phone will never run out of juice. It’s yours for only $19.99.