dual batteries is one thing...
series or parallel...
go the wrong way, and lose customers...
either way you gotta start from scratch with brand new, bought at the same time pairs and keep them married...
forget onboard charging, remove one pair, install new pair...and charge on an external charger...
i dont vape sub ohm and uber high wattage, hell, a well used aw 18650 10 amp gets me through the day...
but if yall want a dual battery shark you should be able to lobby for one...
just dont fuck with my ability to get a Rdna-40 single