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The Anker Zolo Power Bank is a 20,000mAh USB-C battery pack with up to 30W output and Quick Charge 3.0 support. That capacity fills most phones three to four times and can top up a tablet or a small laptop over USB-C. It is built for travel, long days away from an outlet and commuters who charge several devices. Against slimmer 10,000mAh packs it is heavier and bulkier, but it offers roughly double the charges; against higher-wattage Anker models it charges laptops more slowly.
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Lowest price we've seen: $49.99 on Nov 9 at Best Buy. Tracked across 1 store since Nov 9.
Owners of Anker's large-capacity packs generally praise the charge count and reliability, and treat the size as the price of the capacity. Complaints center on weight and on modest output for laptops.
