Its Anker Zolo model easily fits into the list of TSA-approved power banks you can snag on Amazon for under $50. But why is Anker Zolo so much cheaper than Anker Prime and other Anker-labeled gadgets? Introduced in 2024, Anker Zolo mainly prioritizes function. For just $39.99, a Zolo line bank gives you plenty of juice at 20,000 mAh with a 22.5-watt output. The introduction of the Zolo line was a bit confusing, so much so that it took some time for Redditors to crack the puzzle on what's what.