Matt, I think most of the detail you're looking for is in the original post.

Lots of additional detail on them here http://terrorhurtz.com/a123. Each cell is 2.2Ah and 3.3v (3.45 at full charge). Much more tolerant to abuse that LiPo's.

These are the individual cells

http://www.ebay.co.uk/itm/A123-ANR26...item461d7bb4a2

£9.99 each on eBay, so getting 10 in a pack for £35 is a bargain !