The Phantom 4 Pro Battery Cooler by IoidIt is great - really useful when I'm out mapping fields. But I've moved on from the P4P to the Mavic 3 range. I wanted to be able to switch back (the P4P is still a backup drone) so I created a new module to screw onto the original. It isn't quite as elegant as the original (not a perfect fit), but the screw holes line up perfectly and the battery is held snugly. You will of course need to make the original fan module.