Good plan. I made the mistake of letting my Mavic Pro sit for over a year without using it or recharging the batteries. Both batteries are toast and one is swelling. I pulled the drone out before the deadline and planned to update the firmware...
This all stems from a law China passed a few years ago that requires all Chinese manufacturers to cooperate with China's intel services. That opened the gates for concerns about hacking and security. As far as I know, there is zero evidence that...
Amazon is still selling aftermarket batteries and props from China for the Mavic Pro. I just bought both.
The DJI site is no longer selling Mavic Pro batteries or props.
Try this video. The guy tells you what to look for with a controller battery and shows how to replace it.
How to Replace the Mavic Pro RC battery and where to get it
It doesn't appear that there are any more DJI branded batteries available. The DJI site now says, "Not Available in Your Country." But I see batteries for other models still sold on the DJI site.
Mavic Pro Intelligent Flight Battery - DJI Store...