I'm so tempted to replace the batteries in the Solo with some of the new fancy high capacity 30A 18650s just to see how nice it runs... might be like hitting a Solo off the wall PA!
I'd save my money. Even if you can find them with tabs on them (I was unable) or get someone to weld them on for you (I only tried a couple of places, seems a 'lost art' as they now come from China with tabs....or not) so it's safe to build a pack that's not how the
closed loop system Solo uses works.
The heater is turned on full blast (only about 2.5 Amps maximum, 2.0 average.....the 30 Amp potential is wasted) and left to run until it gets to the set temperature when it's shut down (as seen on the "Heat" LED).
The slightly higher power available by such a change only means it will 'make temperature' a few seconds faster on the first cycle and that the 'duty cycle' (ratio of on to off times) will change a little. But
the working temperature in the load will not change at all. Not one bit.
And it will stress the heater all the harder for no useful gain.
Unless you use a stop watch you'll never be able to detect any change and there will be no useful improvement. Period (ever hear that before?). Same as putting a more powerful heater in your house doesn't change how hot the thermostat gets the living room. All it will do is make 'a cold house warm up faster'. My quick calculation just said you can save as much as 12 seconds of the two minutes initial warm up time, and the duty cycle ratio will shift a bit under half a second per cycle. Trivial IMO.
I think you're better advised looking for batteries more suited for the actual task they need to do, not run some other (open loop) vape. They make a big difference is Cera, Persei and similar vapes but not here. Arizer can also make this change (and they can buy the gear to weld the tabs so they can use any battery they want), the fact they don't (and use the model they selected) is a clue here.......I think they've done their homework and know what they're doing.
I'd same my money and buy some top shelf bud to feed the Solo.
OF