USB Battery Pack - simultaneous charge?

[Churten]

I'm looking at the USB battery pack for the RPi (http://www.adafruit.com/products/962) and I have a question. I have another USB battery pack that has the unfortunate aspect that it cannot recharge faster than it discharges, at least for a RPi sized load. Do you know (or can you find out) if your product can?

As a side note, I'd be even more interested if you had a smaller (both in capacity and physical size) battery pack for less money. For my interests, I don't need that kind of capacity.

[adafruit_support_bill]

I haven't tested it rigorously, but I think not. It takes 7-8 hr to fully charge from empty and will run a Pi for 5-6 hours on a charge.