Here if you read this you will see that they only give full capacity if charged to 4.35v and discharged to 2.5v. The problem with this is most chargers cut off at 4.21v and most torches will cut off at 3v. So you can’t get the full capacity of 3400mah.
I will try to find the charts comparing all of the cells. It shows the Sanyo keeping a higher voltage during discharge.