501X and TrakPower Cells
I fitted a set of larger TrakPower 4800SP cells with very few modifications to my 501X.
First, this was to lengthen the rear battery post hole by 1mm. This allows the eacg cell pack to sit between the 2 posts. Photo1
Next, cut / file the chassis brace to allow for the extra hight in the packs. If I did this again I would up a bigger rad on the corner. And added some spacers under the post. Photo2
And that's it. Photo3 & 4
The top of the post does just touch the body, but it still fits ok.
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