Welcome Elyrothh!
Thank you very much for the praise!
There are a couple of reasons for the length of the GPin, which is a much shorter connection than a 510 one. In order to improve the conductivity, we increased the pressure upon the battery's poles, so the GPin is able to be compressed about 2-3 mm with a hard spring and sucks up a ton of battery life to the point of draining them. Second, we have to take in account the variations of the 14500 batteries, and at the same time to be able to inspect, clean and assemble the whole thing easily without tools, even with big hands. Another reason is simplification - compatibility , we decided to use common GPins for
GP Heron 1.0, 1.5, 2.0,
GP PAPS 3.0, 4.0,
GP Piccolo 4.0,
GP Spheroid 4.0 and
GP PAPS X 1.5.
We designed the GPin to function flawlessly with the dimensions of about 40 different brands of batteries. Of course, we can shorten the whole thing, not only the pin, but this will create incompatibilities with the rest models and versions and updating from a previous version, buying for example just the switch, won't work anymore, because the overall length will change. In a future version, we'll shrink the GPin, we have already designed a version 2.0, but for the aforementioned reasons we haven't produce it yet. We keep compatibility as long we can