Those will fit and work, but have a max continuous draw of 6.8A, which is pretty low. There are definitely better options. With those, you should be really careful of the resistance of the coil you use, so as not to exceed the limitations of the cell. Personally, I would not use them for a coil under 1.0Ω.
Might I suggest you look into some high drain IMR cells for use in your mech? It is pretty easy to find cells with a 20A or 30A limit. i think these would be a better choice, if you could swing it.