Battery overdischarge warning

Harrissment · Jul 5, 2017

Hi all,

Hoping you can help me with this warning I have just got a few times while I was in sport mode and also at full speed.

Any info on this?

Bit more info am base in U.K. It's 19c outside right now when am in sport mode and at full throttle this warning will show up pretty much every time after about 30 seconds.

Thank you for you time and help!

I do not get the warning if I don't go full throttle or in normal mode.

Thanks again

Lou · Jul 5, 2017

Are you flying with the gimbal cover on or off?

Harrissment · Jul 5, 2017

Lou said:
Are you flying with the gimbal cover on or off?

It is off, would that matter?

Flycaster · Jul 5, 2017

That can/will happen if you are flying around in Sport mod and at full throttle for more than about 30 seconds. It's been seen before. The Mavic is a flying camera platform, not a racing craft.
I don't think it's about the heat (could be tho), but I think it's more on the current draw on the battery cells. I don't think they have a particularly "high 'C' rating" for high current draw.......

Tonka · Jul 5, 2017

I have had battery discharge warnings when I go full tilt forward and up on sport mode. Does it always give you the warning when you hit full throttle forward or only up and forward?

Flycaster · Jul 5, 2017

I think it has to do with battery load, not craft direction.

Flawless · Jul 5, 2017

Overdischarge will often occur in sport mode at max throttle/ascent. You're asking the drone to move forward and up at maximum speed, effectively putting maximum load on the battery.

Tonka · Jul 5, 2017

Flycaster said:
I think it has to do with battery load, not craft direction.

Battery load is directly related to speed regardless of heading.

Knight Hawk · Jul 5, 2017

Flawless said:
Overdischarge will often occur in sport mode at max throttle/ascent. You're asking the drone to move forward and up at maximum speed, effectively putting maximum load on the battery.

[emoji3]

Harrissment · Jul 6, 2017

That's it then yes I was full throttle going up and forward each time.

Thanks for your help guys

Lou · Jul 6, 2017

Harrissment said:
It is off, would that matter?

The cover can impede the airflow. Look behind the gimbal, see the vents? They assist in cooling the battery pack. As the battery pack heats up, it's efficiency drops and the available current will drop as well.

Harrissment · Jul 6, 2017

Lou said:
The cover can impede the airflow. Look behind the gimbal, see the vents? They assist in cooling the battery pack. As the battery pack heats up, it's efficiency drops and the available current will drop as well.

I never fly with it on, I like it for storage but that is about it.

Flycaster · Jul 6, 2017

You should get one of these:
Amazon.com: Mavic Lens Hood Sun Shade Lens Hood Gimbal Protective Cover For DJI Mavic pro: Camera & Photo
You still get some protection, plus, no lens flare/glare from the clear plastic, and all the airflow needed.

superdave5050 · Sep 5, 2017

Just found this thread because I almost lost the bird yesterday. Was out 13,100 feet wondering how strong the signal was going to be out and completely forgot about battery.
Got the return to home warning now or you won't make it !
Stupid me I then realized I had nothing but head wind on trip back. Cranked it full throttle and with headwind all I could get out of it was 28-30 mph. It started to land a few hundred yards out but I was somehow still moving forward enough to get it back home. It was giving me the battery overheating warning the last 600 feet out. Never had to push it this hard before but now I'm wondering if this battery should be trusted. It was still pretty warm 45 min later.

Texas Mavic · Apr 13, 2019

superdave5050 said:
Just found this thread because I almost lost the bird yesterday. Was out 13,100 feet wondering how strong the signal was going to be out and completely forgot about battery.
Got the return to home warning now or you won't make it !
Stupid me I then realized I had nothing but head wind on trip back. Cranked it full throttle and with headwind all I could get out of it was 28-30 mph. It started to land a few hundred yards out but I was somehow still moving forward enough to get it back home. It was giving me the battery overheating warning the last 600 feet out. Never had to push it this hard before but now I'm wondering if this battery should be trusted. It was still pretty warm 45 min later.

Just had the same experience with a brand new aftermarket battery. EXACTLY.