Battery and motor related warnings

[louist103]

During a flight I have done probably 100 times now I saw a few warnings I have never seen before and couldn't find online. First, when climbing to the first way point, I got 2 warnings that seemed to pop in and out together. They were, "motors overloaded thrust limited", and "battery power limited". To be fair to the system I was at full climb and right stick forward but I usually am on this climb out. During the flight when the batter hit the 20% range the voltage dropped down to the mid 13s. By the time it got to 13-15 it was back to 14.1-14.2v. It ended up getting to a critical level ~%10 but instead of the normal critically low battery warning, it said "Batter power low, please replace the battery".
Some context to this particular battery...
Its one of the original batters I got with the drone around 2020 or so. So its pretty old and has around 120 cycles.
I have had issues with this battery before. At one point the camera would disconnect and then reconnect, but I couldn't take any pictures. When I swapped batteries everything was fine again.
Since this battery is kinda old and I have 2 others, I wouldn't be too upset if I had to get rid of this battery.
Other than cosmetic damage (scuffs on the plastic and such) the battery is in OK shape. There is no visible bulging when looking through the vents.

I can post whatever logs are needed. I just don't really know how to extract them properly since I am an iOS user and the instructions I found are for Android.

 

[louist103]

Regarding the logs, this flight was done using GSP, not go 4. Is there a way to get the logs from that? I don't see a folder for it in iTunes/Apple Device. I only see the logs from the flight a few days ago in Go 4.

 

[Meta4]

They were, "motors overloaded thrust limited", and "battery power limited". To be fair to the system I was at full climb and right stick forward but I usually am on this climb out.

The cell voltage will drop when the battery is under load and the warnings will be triggered by the battery cell voltage.

 

[louist103]

The cell voltage will drop when the battery is under load and the warnings will be triggered by the battery cell voltage.

I should clarify. When the voltage was in the low 13s the only warning was that the battery was low (<30%). When the first 2 warnings appeared it was when the battery was around 50% when I first took off and started to move it to the start point. I will be doing something similar tomorrow so I will try it with a new battery. (~100 cycles)

 

[RodPad]

@louist103,
Welcome to the forum!

@Meta4
Is in my top 10 of flight data analysis, Phantoms, Mavic's

Check this link out.

Thread 'Flight log retrieval and analysis guide'

Jan 31, 2020

I posted this guide on the MavicPilots forum after the introduction of the Mavic Mini led to a significant increase in pilots asking for help diagnosing events and understanding log files. It may also be of some interest over here since most of it applies equally to other DJI equipment. While there is plenty of help and advice available on these forums, and detailed guidance and options on several other websites, I thought that perhaps a single summary of the subject might be useful. If it does prove useful then I'll try to keep it updated, either in this post or followup posts, and...

• sar104
• Replies: 8
• Forum: Phantom Crash & Flyaway Assistance

• 

Data info is more and more important, as time goes on, it is not going to go backwards.

Rod ..

 

[louist103]

This is the DAT from the flight. I took a quick look with the DJI viewer and did see a massive current spike and voltage sag right at the start. Other than that I can't make anything of this data.

https://pub-58b26804d9674418b12864b0ebccc3bb.r2.dev/FLY449.DAT