Extremely low voltage warning

[jwilson]

I was flying my Mini 3 pro today. When I was in sport mode, I got a extreme voltage warning, and it said land immediately. I was over the ocean, so I couldn't land. The battery was at 50%. So I did a RTH. Then I flew manually so I could stay over land in case it crashed. So this warning stayed on. I finally got home and landed. Then in said overheating warning and shut down. I've had other warnings, like over current. I should of marked the battery so I would know if it's only one battery that has a problem.

 

[mavic3usa]

Did you start your flight with near 100% battery strength?

 

[Meta4]

I was flying my Mini 3 pro today. When I was in sport mode, I got a extreme voltage warning, and it said land immediately. I was over the ocean, so I couldn't land. The battery was at 50%. So I did a RTH. Then I flew manually so I could stay over land in case it crashed. So this warning stayed on. I finally got home and landed. Then in said overheating warning and shut down. I've had other warnings, like over current. I should of marked the battery so I would know if it's only one battery that has a problem.

The % indication isn't what matters, it's the actual cell voltages that do.
To have an idea what the issue might have been you would have to post your recorded flight data.
To do that there are a couple of options ...

1. Go to DJI Flight Log Viewer | Phantom Help
Follow the instructions there to upload your flight record from your phone or controller.
That will give you a detailed report on the flight data.
Come back and post a link to the report it provides and someone might be able to analyse it and give you an understanding of the cause of the incident.
or
2. Just post the .txt file here
or
3. If you use Airdata, you can view the flight data on Airdata and post a link for the Airdata report

 

[jwilson]

Yes. Almost always. It did get very windy.

Did you start your flight with near 100% battery strength?s

 

[jwilson]

The % indication isn't what matters, it's the actual cell voltages that do.
To have an idea what the issue might have been you would have to post your recorded flight data.
To do that there are a couple of options ...

1. Go to DJI Flight Log Viewer | Phantom Help
Follow the instructions there to upload your flight record from your phone or controller.
That will give you a detailed report on the flight data.
Come back and post a link to the report it provides and someone might be able to analyse it and give you an understanding of the cause of the incident.
or
2. Just post the .txt file here
or
3. If you use Airdata, you can view the flight data on Airdata and post a link for the Airdata report

Ok. I'll try do do that. Where is the .txt file?

 

[jwilson]

The % indication isn't what matters, it's the actual cell voltages that do.
To have an idea what the issue might have been you would have to post your recorded flight data.
To do that there are a couple of options ...

1. Go to DJI Flight Log Viewer | Phantom Help
Follow the instructions there to upload your flight record from your phone or controller.
That will give you a detailed report on the flight data.
Come back and post a link to the report it provides and someone might be able to analyse it and give you an understanding of the cause of the incident.
or
2. Just post the .txt file here
or
3. If you use Airdata, you can view the flight data on Airdata and post a link for the Airdata report

Ok. I'll try do do that. Where is the .txt file? I don't have a computer here. I assume I need a computer. I'll look into it. Thanks! I was flying with a DJI RC.

 

[Riptide]

Flight log will be saved on the DJI RC controller but I forget which folder. Google “how to get flight logs off Dji RC “

 

[Meta4]

Where is the .txt file?

It's in the internal memory of the controller at:
Android\data\dji.go.v5\files\FlightRecord

 

[jwilson]

It's in the internal memory of the controller at:
Android\data\dji.go.v5\files\FlightRecord

Ok thanks.

 

[jwilson]

Today I flew all four batteries again. Only one had a problem. Battery communication error, and then when I landed, it said overheated. So I put a piece of masking tape on it, and wrote what happened. I think masking tape, and a pen, is advisable drone kit.

 

[Riptide]

Today I flew all four batteries again. Only one had a problem. Battery communication error, and then when I landed, it said overheated. So I put a piece of masking tape on it, and wrote what happened. I think masking tape, and a pen, is advisable drone kit.

Always number your batteries. Call DJI about the bad one. Have flight logs to give them.

 

[Cafguy]

If you have a battery that is starting to swell during use then you get all the things you are speaking of.

 

[jwilson]

If you have a battery that is starting to swell during use then you get all the things you are speaking of.

The battery can't swell, because if it did it wouldn't fit inside the drone.

 

[jwilson]

Always number your batteries. Call DJI about the bad one. Have flight logs to give them.

I've used it two days, being careful not to go far away from land. Also staying out of sport mode. I don't think I got any warning the last two days. My wife has a power bank and we took my multicharger with me. The powerbank would charge it, but slower than the DJI power supply. So in an hour or more it charged to around 75%. So if I get a power bank to charge my drone batteries, I'll try to get one with high current output.

 

[Cafguy]

The battery can't swell, because if it did it wouldn't fit inside the drone.

It swells as it heats up during use! It will fit again once it "shrinks" back ....For now.

 

[Droning on and on...]

@jwilson I think you're making a huge mistake to fly over water, especially the ocean, with a suspicious battery. It could completely fail at any moment.

 

[jwilson]

It swells as it heats up during use! It will fit again once it "shrinks" back ....For now.

But if it swells, why would I be able to take it out right after landing, and not notice any swelling? I flew it again today, and no warnings.

 

[jwilson]

@jwilson I think you're making a huge mistake to fly over water, especially the ocean, with a suspicious battery. It could completely fail at any moment.

I'm being way more conservative with that battery now. No more sport mode, and avoiding flying over the ocean.

 

[Felix le Chat]

Global mini 3 pro IFB specs*

Capacity
Intelligent Flight Battery: 2453 mAh
Intelligent Flight Battery Plus: 3850 mAh
Weight
Intelligent Flight Battery: Approx. 80.5 g
Intelligent Flight Battery Plus: Approx. 121 g
Nominal Voltage
7.38 V
Max Charging Voltage
8.5 V
Type
Li-ion
*source: DJI.com

Pushing a Li-ion (Lithium Ion) battery hard (flying aggressively in sport mode for extended periods of time) will cause low battery warnings. If you carry on doing it: it will also cause the battery to heat up significantly, leading to swelling or bloating of one or more of the battery cells (gassing). This permanently damages the battery cell (electrolyte decomposition), progressively reducing the level of charge the battery is capable of storing. Each time the battery is charged after it has been internally damaged: the gassing will get worse. The damaged cell in the battery stack will fail first.

A Li-ion battery will not be able to cope with heavy draw manoeuvring for more than 15-25 second bursts. Push it past that limit and you'll soon get a battery warning banner pop up on your flight screen. If you slow down and give the battery a chance: it will recover (to a degree) and continue to function relatively normally - giving you a chance to bring the drone down and swap out the battery.

The original DJI IFB designed for the older drones contained a stack of Li-Po cells (Lithium Polymer). This battery type was specifically designed for heavy duty RC vehicles being pushed hard for extended periods of time, which came to include FPV drones: and then consumer class commercial drones to ensure they functioned well and consistently under heavy stress.

All DJI IFB's should be allowed to cool completely before you connect them to a charger. This gives the internal chemistry of the IFB a chance to calm down and recover voltage before you try pushing more in.

In this instance: it's reasonable to assume that the battery isn't at fault - you've just stressed it to the point where it is in the process of failing.

Simple solution? buy another 3 batteries.

 

[jwilson]

Global mini 3 pro IFB specs*

Capacity
Intelligent Flight Battery: 2453 mAh
Intelligent Flight Battery Plus: 3850 mAh
Weight
Intelligent Flight Battery: Approx. 80.5 g
Intelligent Flight Battery Plus: Approx. 121 g
Nominal Voltage
7.38 V
Max Charging Voltage
8.5 V
Type
Li-ion
*source: DJI.com

Pushing a Li-ion (Lithium Ion) battery hard (flying aggressively in sport mode for extended periods of time) will cause low battery warnings. If you carry on doing it: it will also cause the battery to heat up significantly, leading to swelling or bloating of one or more of the battery cells (gassing). This permanently damages the battery cell (electrolyte decomposition), progressively reducing the level of charge the battery is capable of storing. Each time the battery is charged after it has been internally damaged: the gassing will get worse. The damaged cell in the battery stack will fail first.

A Li-ion battery will not be able to cope with heavy draw manoeuvring for more than 15-25 second bursts. Push it past that limit and you'll soon get a battery warning banner pop up on your flight screen. If you slow down and give the battery a chance: it will recover (to a degree) and continue to function relatively normally - giving you a chance to bring the drone down and swap out the battery.

The original DJI IFB designed for the older drones contained a stack of Li-Po cells (Lithium Polymer). This battery type was specifically designed for heavy duty RC vehicles being pushed hard for extended periods of time, which came to include FPV drones: and then consumer class commercial drones to ensure they functioned well and consistently under heavy stress.

All DJI IFB's should be allowed to cool completely before you connect them to a charger. This gives the internal chemistry of the IFB a chance to calm down and recover voltage before you try pushing more in.

In this instance: it's reasonable to assume that the battery isn't at fault - you've just stressed it to the point where it is in the process of failing.

Simple solution? buy another 3 batteries.

This is great information. Where did you find this? The owners manual. Where I am now, the place the waves break is very far from the shore. So since flying over the ocean is boring, I go into sport mode to get to the surf zone faster. Fortunately the battery I had problems with has stopped giving errors because I not going into sport mode. I wonder how many mini 3 Pro owners know this. Thanks a million!