Phantom 4 Bat Cooler

thingiverse

I purchased my DJI Phantom 4 Pro drone and love every minute of it! In fact, I bought two extra batteries and the three-port DJI charging station so I'd always have a charged battery on hand while others charge. One thing that's really noticeable with LiPo batteries is how hot they get during high discharge - not like they're going to explode or anything, but still pretty warm. When you're ready to put it on the charger, you need to wait for it to cool down before it will accept a charge, and the battery itself won't even let you do that until it's cooled off enough to charge safely. The Phantom 4 batteries are definitely an improvement over the Phantom 3 batteries in this regard. They have air cooling channels between the LiPo cells that help them cool faster and reduce heat transfer between cells. When I saw this, I thought, "Now if I could just blow some cool air through these, it would cool down even faster!" And with that, the idea for the Bat Cooler was born. I used a small CPU cooling fan that I had lying around and cut off the JST power plug from it, then soldered on a female barrel connector so I could use a standard 12-volt DC wall adapter to power it. Since it's so small, I haven't installed any safety screens - I don't think they're necessary in this case. The internal fan diameter is 67.85 millimeters, and the side-to-side measurement of the fan is 72 square millimeters. The airflow goes through the fan, through the battery, and out the oval exhaust ports. One side of the end of the battery has a bit more of a lip than the other side does, which goes down into the fan enclosure, while the shorter side goes into the side with the notch - you can see this in the pictures. If you'd like to power it from your car or truck, just make a 12-volt DC power cord with either a cigarette lighter plug end or alligator clips on it. UPDATE: As per request, I modified the original design to accommodate two batteries at once. Since it's longer now, some printers might not have a large enough bed if laid out as shown, and standing it up might cause issues with Z height (vertical) in some cases. Your print software should let you know if it's too big one way or another. If you like the design, be sure to hit the LIKE button! If you've printed one, share it with others by choosing I MADE ONE. And feel free to leave any comments or questions in the comments section.