Cobra, thanks for that, I just noticed that too. You are a true asset to this forum. Thanks for your watchful eye.
The OEM battery cord does have different plug sized. This is to keep the In and the Out identifiable. If you are needing the OEM Battery Cable, just order it from us, I think with only get $3.00 and that is shipped to your door. You can drive out and get on for that.
The original questions of needing the email side of what the iFly 720 12V plug is the same. However the opposite end of the Battery cable, the tip small than the iFly end is a 2.5mm ID x 1.3mm ID. Basically the battery cord (cord that goes between the Battery and the iFly) has two different size tips. The iFly end is 3.5mm OD x 1.3mm ID and the Battery end it 2.5mm OD x 1.3mm ID.
I hope this helps clear it up and sorry for any confusion that may have happened.