Quick thought experiment: right now, you can go out and buy a portable charger with a battery inside. For $40 or so, you can get one roughly the size of carryin

Quick thought experiment: right now, you can go out and buy a portable charger with a battery inside. For $40 or so, you can get one roughly the size of carrying a second smartphone with 5000mAh, which is several full charges for your average smartphone. You can throw it in a purse or spare pocket and have it when you need a charge and you're not near another power source. It's not fiddly like opening the case of a phone and swapping out the battery, but the big problem with this is having to leave it hooked up while it charges if you're still using your phone. With fast recharge, this would go away. Hook it up for a minute, charge the phone up, unhook it, put it away. Easy peasy. For me, at least, this would be a huge win. YMMV Edited to add: with fast recharging, you could also recharge the portable charger itself if you ever come in contact with an outlet. So let's say you have two really long flights with a short layover. Find an outlet for a minute on the layover, recharge the charger, and you now have your charger ready to go for the next flight. Win.