hmmmm, I will redo my calculation...
I did do it late at night and at altitude but I was fairly certain it was in the giga coulomb range.... (I was stuck with the windows calculator as my only calculator...)
No matter, It is still hard to imagine containing 1 Coulomb or 100 Coulombs, much less 8.8 million or 8 Billion...
The only possible way I see doing it is to find an efficient way of making neutral cold antihydrogen... and since only a few HOT anti-hydrogen atoms have been briefly created, I doubt making milligrams of the stuff is likely anytime soon.....
neutral anti hydrogen could be trapped (at very low density) using lasers...