Switching Married batteries between mods

[OcEaN]

Hello,

I have a Therion Mod with 2xLG HG2 batteries in parallel.
Is it safe to use these batteries in a Reuleaux RX2/3 in series?

[yoseff]

I believe so. I also have a Therion and an Efusion Duo and rotate batteries between them. If they are being used together they age the same way, so should be no problem. But maybe some battery expert can enlight us more

[Spirometry]

If using the Reuleaux in a 2 cell configuration, then it's no problem. It is safe to switch a married set from parallel to series.