And if it does work, are you using the stock cable?
Trent IMP1000 - http://www.amazon.com/New-Trent-IMP1.../dp/B003ZBZ64Q
Incredicharge I-11000 - http://www.amazon.com/Incredicharge-.../dp/B006YJEBGK
Might not be what you wanted as this only has 5Ah capacity for its 3,7v internal battery, but Sanyo Eneloop KBC-L2B does the job albeit with only 1A ouput (half the original charger rate).
NB : Tested on GT-P5100, should have more or less equivalent results
Trent iCruiser IMP1000 11000mAh specifications page reveals only 1A output at 5V, meaning it may or may not work depends on the room temperature.
As written on the Tab's original charger, the power controller on the tablet can pull out as much as 2A power from a charger. This means that on a charger (either portable or wallmount) that's only rated at 1A, the charger will work at its maximum capacity. It will all comes down to the build quality of the charger, and mostly its heat dissipation capability. If the charger gets too hot, it will cut of its power.
With that being said, you may wan't to stay away from Incredicharge. There's no written spesification nor contact number on the official page. Getting this is gambling based on customer reviews only.
You might wan't to scout some more alternatives, preferably one with a minimum of 2A output. But if it comes down to those two, Trent iCruiser IMP1000 11000mAh is the better bet.
NB : Original cable works fine.
NB : Just reread my reply, i sound like an old man talking to his grandchild Really sorry about that.
Both of these provide 2A output.
Anker Astro3 10000mAh - $59.99
EZOPower Black 2-Port Ultra High-capacity Portable External Rechargable Backup Battey Pack -10000mAh - $54.99
Another iSound...this one is 16,000mAh. I've been eyeing this one for the tab...
If you look around you can often find discount coupons from this company.