Mini 3 Pro batteries still fine after 2yrs, many charges and half charges, quite often fly with only 50-60% and rarely discharge it to less than 10%.and sometimes don't fly for months. I don't treat them with kidgloves either, although many of...
You shouldn’t need to unpair or unbind it from the original controller just to pair it and use it with a new controller. However, you will need to unbind it from the original controller to use for more than 5 flights, and Fly Away coverage only...
If there was I would imagine the cost of it would be significantly more than the cost of a new mini 4 pro. Could always hire a scuba diver,or get a snorkel and have a go yourself. 😁