RASPBERRY-PI Battery?

I found this 5v battery pack on ebay for about 20 bucks http://www.ebay.com/itm/12000mAh-External-Portable-Emergency-Battery-Charger-Power-Bank-for-mobile-phone-/121090018244?pt=Battery_Chargers&hash=item1c31870bc4 it hs 12000mah which is good do you think this is good buy for a RASPBERRY-Pi

is this a pretty good deal or should i keep looking around im trying to get a portable computer going with the PI and i would like the max battery time the pi will run wireless keyboard mouse and wifi as well as some peripherals like ir

Maybe this would get a better answer on a Raspberry PI forum?

For a device of that size there's no way it's actually 12000mah. Maybe 6000mah at most, but more likely in the 4500mah range.

Apply a bit of skepticism when you're looking around on eBay.

What’s a Raspberry PI?