Not used my Mavic Air in years and to no surprise both batteries I had were dead. Broke them apart and soldered wires on cell terminals and charged to 11.5V. Used DJI battery killer and a CP2112 board. First battery - no problem, worked fine and fully working. Second one CP2112 couldn't connect, after a lot of messing about I stuck it under a microscope and checked the connections. Found dry and cracked solder joints on several of the socket connections where they are soldered to the PCB! Resoldered all of them and it connected immediately and unblocked.
As a precaution I took the first battery apart again and resoldered all of those too - a couple of the positive connections were definitely flaky. So if your drone suddenly dies highly likely its dry unleaded solder joints.. Nanny states and "Health and Safety" rules have a lot to answer for...
I repair Guitar Amplifiers as a part time business and routinely resolder modern amps throughout with Leaded Solder as 90% fail through this and/or rubbish cheap capacitors failing.
Steve
As a precaution I took the first battery apart again and resoldered all of those too - a couple of the positive connections were definitely flaky. So if your drone suddenly dies highly likely its dry unleaded solder joints.. Nanny states and "Health and Safety" rules have a lot to answer for...
I repair Guitar Amplifiers as a part time business and routinely resolder modern amps throughout with Leaded Solder as 90% fail through this and/or rubbish cheap capacitors failing.
Steve