Too bad you can't charge the batts while leaving them in series. That might save you more than an ouce right there, depending on which harness you're using.

I decided to use the MPI power pole arming switch, but cut the ESC and battery connectors off and simply soldered it into one of the ESC leads. Total weight penalty after that was 14 grams vs the 32 grams without the mod.

Good luck on the maiden!