G.Leave
Cultivators Club
Ok that really help isolate what you need.
Given the limited availability of charging current, you want something that can charge quickly. You might have to dig into specs to really see the numbers, but generally speaking if you get a charger that plugs into a mains socket, it will charge faster than one that charges from a USB connection. It come's down to current limitations of USB.
With that said, even a USB charger will push current into the battery. Well designed ones will do so at the max current. It might not be as robust as the AC adapter modes, but it will still charge. It might be enough depending on how much energy you need to take into the field each day.
So at night when there is no incoming power, would it essentially suck the battery from the computer and leave me with a charged bank after 8-9 hours do you think? For me that would be absolutely ideal. At the end of the night, leave the computer running and leave the USB charger for the bank plugged in to charge up while i sleep.