Check out the Phantom Angel here:
https://bit.ly/PhantomAngel
Check out the New DJI Mavic Air 2: https://bit.ly/2MavicAir
If you own a DJI drone and want a good way to discharge your DJI smart batteries for storage or to do a deep cycle on them, then you should check out the Phantom Angel. Despite the name, it can be used with a variety of DJI drone batteries. Keeping your batteries stored at about 60% capacity can help extend their lives and is safer than keeping them stored at 100% - especially if you are going to take your drone on an airplane!

The PhantomAngel is made by a DJI drone pilot and is available for sale on his web site. To learn more, visit: https://bit.ly/PhantomAngel