Epic 262 Bottom Mount Battery Plate
thingiverse
To install a second battery or bottom-mount battery on the Multicopter Builders 262/Cinematic 7 frame, you'll need to swap out the inner arm mounting screws for longer ones, measuring in at 15mm. These new screws will securely hold the arms in place just like before. Place the plate over the screws and secure them with metal locking nuts. Make sure to put the battery strap on first, then tighten the nuts down firmly. I've yet to test this setup in flight, but it appears to be quite sturdy so far.
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