Went back to use my apollo few days ago after a few weeks hiatus due to new vape honey moon (100% convection on deman-nice)
Apollo still is my favorite no questions
If there could be the choice to power it with both a couple of externally charged 18650 like this day, or a proprietary battery pack rechargeable through usb connection in a cylinder shape (and obviously possibility to swap between options), I would buy rechargeble battery no questions as I can manage to wait for charging time, and while I like open source/ cheap side of 18650 i find extremely annoying battery routine.
And while on it, why not a wired power supply?
Also
@Ratchett what about a fine mesh screen basket shaped to put on top of load ? it would allow to adapt to load size without need to move cooling unit. I did few miself and use everytime but they are not very nice, still they do great job and despite mesh being very fine it stays clean