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There’s nothing worse than being stranded with your phone hovering at a precarious 3%. And whether stranded to you means imminent danger or a train ride next to a particularly chatty stranger, having the option to charge back up is one that most of us will willingly take.

The good news is that there is currently an amazing deal on this $100 Rolosar Portable Charger that’s now on sale for a mere $20. At 80% off, this is a great time to take advantage of this Amazon Black Friday sale.

Rolosar Portable Charger, $20 (was $100) at Amazon 

Courtesy of Amazon

Lightweight and slender, this charger is most ideal for travel, or just always having in your tote bag or (shockingly) your pocket. “The slim design makes it so easy to slide into my pocket, which is rare for power banks with this much capacity,” said one shopper. “It doesn’t feel bulky or weigh me down, which is a huge plus!”

Not only is it TSA-approved, but it can provide enough power to charge your phone 2.3 times, or an iPad 1.2 times. It also has universal compatibility with four different ports, including USB, Micro-USB, and type C for faster charging.

Related: Walmart’s bestselling $300 mini fridge that ‘works flawlessly’ is on sale for only $111 for early Black Friday

It also has a screen with real-time power monitoring so you can easily see how much power is left in your charger. “Excellent portable charger to bring with you on a weekend trip,” said one shopper. “We had an upcoming trip to New York and needed something that would allow me to watch movies there and back. It charges my phone quickly which is what I needed.”

This sale is a Black Friday-exclusive deal, so make sure that you shop it now before it disappears—or before you’re cursing your dying battery on a long layover