Went looking on Amazon & there's a small 5000mAh/20Whr powerbank that alleges to be graphene and alleges to be chargeable at 65W. Awesome if true.

I have some pretty monster 20000mAh/75Whr batteries that can charge at 45W. That's 4+ hours of charging. This pack charges in ~20 minutes. I like the idea of switching to a small pack that can recharge itself quickly. A lot of my extra-battery usage is for cafes & other mobile-warrior situations- there's often power, somewhere- just not right next to me- and being able to run off the supplemental pack, then go plug that pack in, and retrieve it, back and forth, basically keeping my systems topped up, sounds super appealing. I guess I'm a little special because my laptop is pretty power sipping, low-power i5-7200U, only has a 35Whr battery, so even these 20Whr could be a significant help.

The upsides are: 50% faster charging, & would be having a lighter carry. Ultimately, efficacy when at wall-power is a huge factor; being able to grab some juice & go helps so much. And then the weight factor: my current pack is ~1 lb/440g. Numbers are a little less clear but this random graphene pack doesn't seem _that_ much light, ~275g, but still a win.

From a more macro perspective, if this spec goes well, we're going to need those 280W that USB-PD Extended Power Range gives us, for laptops &c!