Ifyour power bank is charging slowly it could be due to using a wall charger with lower AMPs/power. Wall chargers come with different AMP levels, and usually this is printed on the charger itself. 1AMP wall chargers are the slowest wall chargers available - it can take over 24 hours to charge a power bank 20,000mAh or higher with one of these BuyINIU Portable Charger, Slimmest Fast Charging 10000mAh USB C in/Out Power Bank, 22.5W PD3.0 QC4+ Battery Pack, Portable Phone Charger for iPhone 15 14 13 12 11 Pro Samsung S22 S21 Google AirPods iPad: Portable Power Banks - DELIVERY possible on eligible purchases Ina nutshell, the lower the wattage of the power bank, the longer it will take to charge your laptop. Using a commonly seen 5V/2A output port may take even as long as 12 hours even when the laptop isn't running. Battery Capacity. When charging a laptop with a power bank, expect it to be bigger than your conventional power banks used for BuyAnker 20.1K Portable Charger, Ultra High Capacity Power Bank with 4.8A Output and PowerIQ Technology, External Battery Pack for iPhone 15/15 Plus/15 Pro/15 Pro Max, iPad, Samsung Ultra-High Capacity Fast Phone Charging with Newest Intelligent Controlling IC, 2 USB Port External Cell Phone Battery Pack Compatible with iPhone,Android etc. BestSolar Phone Charger Power Bank Anker PowerCore Solar 20000. Shop at Amazon. Shop at Amazon. and it took eight hours on a very sunny day to completely charge the power bank with the Nomad b4a3OP.

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