Here's some follow-up that I've been working on to show how DJI's "GPS Altitude" is derived from atmospheric pressure and can vary with the weather by +/-200 metres.
For some months, I ran some test flights with a Mavic 3 pro from a known...
You can purchase 3rd party chargers that have a setting to charge the batteries to 60%. I have these for all my drones. They have the added benefit of being able to charge 4 batteries simultaneously. I even have one for my Air 2s that will...