oh fuuuuuuu bad practices at work!
I bought an XT60 splitter! and not the responsible 'load balancing' kind! just a Y! and I "fixed" another battery I have so it "looks nice" (put its endcaps back on to hide the wiring, replaced the charging port with one that's compatible with DC22 barrel connectors like all my PEVs), aaaaand I couldn't finish charging it coz i don't want to leave it overnight. Tomorrow I find a way to fasten it to the frame! <3 so excited!