Mobula7 Two-piece lipo holder 1S or 2S
thingiverse
I remixed this part so you have one piece sitting in the frame of the mobula and a second piece working like a strap for your batteries. You may have to measure the thickness of your batteries and print different sizes untill you get that perfect fit where the battery can not fall out and is not to tight in the strap. I guess it is pretty universal like this The batteries i used are Gaoneng GNB 650mah HV lipos, i got them from amazon, gaoneng says they are 16x59x7.5mm in dimension.
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