fimi x8 se battery connector / dual car charger

thingiverse

If you decide to build this charger, be aware that I'm not responsible for any damage or issues that may arise. You're building and using it at your own risk. I've used this charger on my motorbike many times without a problem, charging my two batteries multiple times. However, there are two things I dislike about this "smart" charger: - When the battery is around 80% charged, it stops charging to prolong its lifespan. - If the motorcycle battery drops below a certain voltage, the charger won't charge Fimi batteries. I measured the power usage when the charger had three LEDs lit on the battery. It was 14V*1.59A=22.26W, which is lower than the original charger's maximum of 13.05V*3A=39.12W. The battery actually regulates the charging current in this case. As of May 30th, I've fully charged one Fimi X8 SE battery and partially charged two others for about ten minutes. There isn't a dual car charger available specifically for the Fimi X8 SE. That's why I decided to make my own. To build your own charger, you'll need: - A DJI Mavic Air charger (available on AliExpress) - 2x8 pins - One small universal PCB - Cut the Mavic connectors (red is positive and black is ground; white isn't needed) - Cut the universal PCB to size (10 pins for the connectors and 3-3 pins on the side) - Make wire lines on the PCB with a soldering iron (- - + + NC NC + + - -), referencing the pinout on your original Fimi adapter - Solder the back of the pins into the PCB, making sure they're parallel to each other - Connect the +/- wires to the PCB Before using your new charger, make sure you've checked the output voltage polarity. If everything looks good, try charging a battery. If it's working correctly, you can proceed with assembling the housing. To assemble the housing: - Print the housing and clear any holes (you can use a 3mm or 3.5mm drill) - Attach the top part to the battery - Connect the charger to the battery - Glue the two parts together quickly, making sure not to attach the housing to the battery (or you'll be in trouble) Once the glue is dry, apply some hot glue on top of the PCB to fill any gaps from the housing's bottom part. While the glue is still warm, fit the parts together tightly and keep them that way until it hardens. That's it! Your Fimi X8 SE charger is now ready for use.