Contacted a partner company today which is building our Li-Ion batteries.
The CEO gave me the following informations:
They have and use these UR14650P cells and the Panasonic/Sanyo batteries are identical.
Actually the correct brand would be Panasonic, but in some areas they are still labelled with their old Sanyo brand, which is established there.
The bad news these cells are not meant to discharge constantly with more than 1C (~1A).
The 1800 mA is the peak value.
So they will age more quickly and loose capacity after a few recharge cycles.
But as we normally donīt use the same pack for 8 hours everyday, it should be ok.
It is correct, that they are unprotected, as they are meant to be industrial cells to build packs.
Unfortunately it is restricted by law in Germany to sell unprotected cells to private customers
There are some small flashlight shops who sell unprotected 18650s, 18500s and similar, but except the Trustfires absolutely no 14650.
And a professional company like the above mentioned would never sell these to private customers, as they could loose some licenses, which would easily ruin them.
So the search is going on.