So, I have a RavPower brick w/ built in AC (20,100 mAh) and boy does it suck. I got it in December and never had a chance to use it. Luckily, it's also defective and Amazon is giving me a refund. (Only charged my iPhone once and was dead.) Via USB-C it's only 2.4 Amps. I can use the AC plug, but that entails carrying around the wall charger still and the efficiency is awful and still results in a ridiculously slow charge. Anyhow.... It seems that nothing from Anker, RavPower, etc... can actually charge a MacBook Pro. I get that the wattage is maxed out at 30w. on most of them, so that it would be a slower charge... but the reviews are endless of people saying that it doesn't even keep the current power when connected. :-( I'm not expecting miracles, but perhaps something that could give me another 50% to last a few more hours. I've seen the talk about Mophie's XXL Usb-C bank, but again, only 30 w. Are we still in the early days of battery packs and awaiting better technology?