GnarlyFPV Primo 3s battery holder
thingiverse
This is designed for a 3s Lipo, having been thoroughly tested on the 65mm Primo (the original). As I only have the 65mm version, my experience with the Primo 3 remains untested. I utilize GNB 3s 450mah lipos in this holder on my quad. I've included two files - one is 2.5mm thick, making it more robust but heavier at approximately 2g. The other file is 1.5mm thick and weighs about 1.2g. I'm currently using the lighter version with satisfactory results. I prefer Sainsmart TPU for its performance.
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