Originally Posted by
wco81
Do other packs with 15k or greater mAh capacity also take so long to fully charge?
As pointed out, some older packs only charge at 5V/1A so that's pretty slow. Most modern packs can take 5V/2A (10W) which helps, but I'd recommend looking at something that supports USB-C PD (such as this
RAVPower) which can charge at 15V/1.5A (30W), very quick! Anker is apparently coming out with a similar USB PD pack as well.
Many phones use USB PD to charge now (Google Pixel, for example), and these packs can also be useful for laptops such as Macbooks and Dell XPS.