it doesnt realy proof that the power coming from your external battery pack isnt running through the acutaua built-in pack, does it?
mph --
I'm not sure what it proves. The message on the battery icon on the desktop read "Plugged in but not charging." To me, that indicated that the Pro was drawing its power from the external source first, as proved to be the case when the external battery discharged first. That is an important sequence. I built that battery pack for my Ladyfriend to use in her travels, especially long flights (Atlanta/Shanghai). That means she can use up the external battery and still have the fully portable Pro with a full charge.
Don't worry about your English. You manage to convey your point quite well. Besides, I am accustomed to it. Sometimes my Ladyfriend will apologize for her English, and I usually say, "Ok, Babe. We can use your English or my Mandarin." Since that is not a choice at all, we proceed in English.
As to being an "electronic engineering mastermind," don't worry about that either. Most of us, certainly not me, are not either. Fortunately for all of us, there are a couple of guys here who are, and they are always willing to help.
I have since assembled an external battery pack for my Pro, so if there is something I could try that would further your inquiry, just let me know. I'm always eager to learn, too.
Take care,
Russ