25,000 mAh Laptop Power Bank

In anticipation of an upcoming week long national council meeting with 13 hour days I decided to invest in a Power Bank to ensure I could keep my Surface Pro 9 going throughout. After a bit of research I settled on the Cygnett 25,000 mAh because 1) it seemed to offer all I needed, IE the ability to charge my Surface pro AND a phone (if necessary) and a percentage charge indicator, 2) the company was Australian, 3) weight and size were acceptable and 4) a good price, especially with a 15% first shopper discount and free shipping when buying off the Cygnett website. On first use I was a bit disappointed; it took the full Power Bank charge to recharge my computer from 21% to 62%. Subsequent tries were much more satisfactory, recharging the computer from 21% to 100% using 60-70% of the Power Bank's charge (variation depended on how much I was using the computer while recharging. These subsequent uses were much more in line with my expectations from the product description on the website and quite satisfactory. Operation is very simple, just plug the Power Bank into a device and away it goes, no need to press the power button as suggested in the operation guide. Recharging the Power Bank takes several hours, probably a little longer than expected. I've not had the Power Bank long enough to know how well it retains charge over an extended period of time but over a week of just being packed away saw no loss in charge. Overall, I am quite satisfied with a product that does what I…