I ordered them too
(now awaiting delivery ...)
How long did postage take in your case ?
Note: ElectricWingman sells them too from UK stock...albeit at twice the price point. I say it's worth taking the risk* ordering direct from China.
(*) delivery, delays, warranty, taxes, etc.
6s A123 Battery Packs - 19.8V
I contacted Li Ping about making a LifePo4 5Ah pack (which is not on their official catalog). No problems, it costs about half as much as my 10Ah Ping battery, and it's literally half the thickness.
The Li Ping packs use prismatic pouches, not cylindrical cells, and they come with a balancing circuit. The Li Ping electronics are top-notch, but in practice, the A123 packs (although based on the same LiFe "nano" chemistry), do not need balancing.
For me the main problem with the Li Ping packs is that the shape is constrained by the size of a single pouch (150mm x 105mm x 15mm), so my 10-cell 150mm-deep 10Ah pack would reduce down to 75mm, but still with a 150x105 face that is not very pocketable (in terms of Brompton luggage). That's why I went for the lower-capacity A123 pack based on cylindrical cells (just under 2.5Ah), which also happens to be less fragile than the more exposed sheets in a prismatic pouch cell.
http://www.pedelecs.co.uk/forum/electric-bicycles/4734-diy-stage-2-received-li-ping-lifepo4-battery-photos.html#post59988
Yes, that's the difference betwen cylindrical cells (A123 or 26650) and LiFePO4 prismatic pouch cells.
Cheers, Dan