You will most likely never hear from the seller you returned too.
Why would you return your old batteries to anyone? Unless you hoped for them to be seen as "returned". It is a crime called "Wardrobing" and you could have a problem, Possibly,OR...
Yes, I can use litchi for my Mavic 1 but my mini 4 pro isn’t supported by either version of litchi. DJI haven’t released their SDK for iOS for the Mini 4 Pro so litchi can’t program for it. The drone flies well enough using DJI Fly and modern iOS...