It depends on your battery size, the usual problem of fitting lipos is that the radio trays make the battery compartment too narrow for a lipo and needs the backs of them sanding down. Usually you end up removing so much you sand completely through the back of the pivot hole, but they stay in place fine. You can fix the problem by getting an F104WGP, the chassis has two wings either side of the chassis plate for the electrics.
You will have a hard time finding an F104Pro, it's long since been discontinued and replaced by the F104X1, F10WGP and shortly by the F104ver.II Pro.
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