Yes, There is a polyfuse in each battery tube. New lithium battery chemistry like LifePO4 and LiNiMnCo are much safer than the old Lithium-Ion types. Still, you should take precautions when handling.
Here is some info on the LiFePO4 cells.
Battery tube leaks are rare, but do happen occasionally. You can see in this post that the LiNiMnCo cells didn't catch fire or explode when coming in contact with water.