Adding 2nd battery to backfire G3

Hey guys new to the world of esk8. I have a backfire g3 and I just bought the upgraded g3 plus battery and am wondering if instead of just replacing the battery, could I run both of them together?

The current battery I have is the 50.4V 260Wh 12S with 21,700 battery cells. The upgraded battery is 50.4V 346Wh 12S with 21,700 battery cells.

The upgraded battery from backfire comes with the enclosure and everything, I did the measurements and the enclosure will fit underneath the board next to the other one. I spoke to someone briefly and he said all I needed was an XT60 split adapter is that true? How do I charge them? Do I have to charge them individually and disconnect them every time or what?

you do not want something in the middle of your backfire.

image

Can you show some pictures of that?