The body for the F10 is wide enough to fit 6-cell packs under it, or you can cut out a section of the body and use inserts to provide the Coke-bottle shape undercuts look way better; a 4-cell pack will fit under the inserts. If you use a 6-cell pack you don't use the inserts, so you have a flat-sided body which is wider to fit the extra battery length. The kit comes with different battery holders to fit 4-cell and 6-cell packs.
Out of the box, though, the 104 Pro is probably way better equipped than the F10, but there are a lot of options on the list for the F10.