I haven't read all of the comments, but It appears many have had issues with battery voltage and drones falling out of the sky. I had that happen a couple months ago on a replacement ANAFI. It had the battery it came with and it fell just at around 29%. Luckily it was within a 30 day period and I was able to return it for a refund explaining what happened to the seller.
Got another replacement shortly afterwards. I haven't flown it too much recently, but I only used my original ANAFI's batteries with no issue (I legitimately crashed my original/1st ANAFI).
Anyway, I subscribe to a YouTube channel. The guy does a lot of range testing somewhere in SE Asia. He also promotes/sells a controller that extends the range of the ANAFI among other drone products. He just put out a video claiming that Parrot has a design flaw in how the battery voltage vs. % of battery left reported.
First, the battery has two cells, so all voltages are per cell. The upshot is that the battery goes below 3.7v (per cell) on a fresh battery at around 43%. According to him, that's the critical voltage as far as battery health. When the battery gets to 3.0v, the drone shuts down. Not lands, shuts down, as there's not enough power to operate the drone. The motherboard needs 6.1v total.
So if we are flying our drones like a normal person where we land somewhere between 10-20% of battery left according to the app, then we are killing the battery. So at some point we will experience the ANAFI falling out of the sky when the app says we have plenty of battery.
He said that Parrot intentionally removed a cell vs. the Bebop series to save weight. But didn't factor that into the Freeflight app as far as battery health since a fresh battery will operate just fine. Somewhere between 20-30 cycles of normal flying will cause these crashes when you have 20-30% battery left.
Here is the link to his video. It's a bit dramatic (that's his style), but he demonstrates the voltage draining in real time in a before and after type of video. The after from replacing the LiPo cells in the battery with new ones.
A little theatrical performance but he gets his point across. Something we have suspected for some time now.
parrotpilots.com
Bottom line is that the drone has become untrustworthy after a small number of flights on a battery unless you strictly adhere to landing it with 43% or more battery left. Or just risk it and then keep buying new batteries.
I'm no expert in LiPo or drones in general. I've only had mine for a year. But this all seems legit. What do you all think?