This is a Holder for a Fairphone 4. I designed it to replace a holder I already had in my car that was too small for the fairphone, so there were parts, that I already had installed and reused. (Ball-joint and gooseneck) I included a stub balljoint with a throat od of 5mm that has a 2.5mm bore so you can screw a m3 bolt in there. The fit of the holder works great with my own bumper case, but I had a bigger one on there before and that still fit. The female part of the balljoint is fixed to the holder with 4 countersunk 10mm M3 screws. printing: If you want to use it in a car, use heat resistant filament with good layer adhesion. PETG might work, I used PCTG and it works great. Parts with threads @0.1 layer height, the rest@ 0.2mm. Annealed PLA might also work. Give it plenty of printing temp for better layer adhesion, especially the balljoint parts need it.
Is this the perfect battery?
No, this is old tech and if it was, we'd already be using it.