I was able to make a HP Pre 3 replacement battery with exactly the same specifications as original one.
Original and mine are both using Samsung cell ICP474350N with capacity 1230 to max 1250 mAh
I have also checked other suitable batteries from Chinese manufacturers to get a better price, and they are offering about 1100mAh for the same size.
I have made a few samples for me and my friends. A few with Samsung ICP474350N and a few with Chinese cells and all are working great.
I am planning to make more with Samsung cells for one of our customer & I wonder are any of you guys interested in buying them. I can sell them for about 20€ (26 US$) with included sending by unregistered snail mail. I think sending from EU to any EU country or even worldwide wouldn't be very expensive even if sending by registered (signed for) snail mail, i need to check for that first.