The GFX WILL NOT charge a battery that has no or little voltage, it'll throw and error message. The Turbo 35 will charge no problem....so I use the 35 or my pit mate's Pit Bull to put a bit of charge in there (5 seconds or so) and then move it over to the GFX.
So I unshort and charge right away. If you only have a GFX, you may have to leave the pack for a bit for the voltage to go back up enough for the GFX to charge it.
No prob, I don't mind sharing info
I need to learn some motor tricks though....those tricks he still won't show me