I have a 2250mAh 11.1v 3 cell battery that I'm using for my 450 kit build, motors are 1000Kv motors. 

Using a Pixhawk with the PX4v1.3.3 flight stack, loaded via QGC.

And I'm using an Imax B6 charger for the battery. Battery is brand new.

This is the issue; I will plug the battery in, with the props off, as a system check. I can throttle it up all the way, no problem. QGC says batteries are at 100%. External voltage meter says all 12.1, no1 4.03, no2 4.03, no3 4.06. 

System check looks good, so I put the props on.

I get the UAV up and within seconds, QGC tells me that the battery has dropped to 33% and the Pixhawk battery alarms go off. The external voltage meter, that is set at 3.6, does not go off. 

I keep it up for a few more seconds and the battery level drops to 17% and the alarms go nuts. I set the UAV down, for a flight time of mere seconds. 

I will then unplug the UAV from the battery, wait a second, plug it back in and reboot. QGC will say the battery is still at 100%. External voltage meter hasn't changed. 

So with the props off I have no issue, but as soon as I put the props on, the battery can't seem to handle it.

What am I doing wrong?

Thanks you for any insight.

Cheers!

_M

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I think you'd better change your battery fully ,which the B6 tells you it's fully . Then go on your flight.
I think you'd better change your battery fully ,which the B6 tells you it's fully . Then go on your flight.

I indeed do that. 

The setting on the B6 for LiPo Charge is 2.2A 11.1V(3S)

And the B6 tells me that is is charged. 

In fact I've replicated this issue twice. Before this last test I took the props off and drained the battery, to around 3.4v per cell. then I did a full charge before today's failed flight.

_M

That means two platforms tell that your battery is fully charged at first,but when you start your flight,the battery is used up so quickly
How about use another new battery? And the 2200mAh battery usually can be used about 10-15mins ,so choose or borrow a large and new battery. maybe that's ok.

For what it's worth, I have the same issue.  All is good on the ground with a 100% charged battery, but then after 10 seconds in the air, I get a RED main LED and a constant beep.  SD card has some log files showing 'Battery Low' and Battery Critical', even though its not.

This just started happening recently.  It wasn't a problem last month.  I did load new firmware, the latest, and this is now happening.

No idea what to do.

Did you calibrate the power module?

George

Hi George - I am trying to figure out how to do that now.  Looks like in QGroundcontrol, under Parameters / Battery Calibration, I just need to manually enter values?  Or is there some automated process to do this?

Thanks!

Derek

Derek,

Looks like we have the same issue. I only have one battery though, so there's no way for me to tell if it's a PX4 Flight Stack error or a battery malfunction. I understand that I should just get another battery to test that idea, but I want to make sure I'm using a proper battery for a 450 1000Kv quad. And everything I have read and asked confirms that a a 2250mAh 11.1v 3 cell battery is proper. 

Does your issue occur across different batteries?

Cheers!

_M

I am waiting for another battery to show up.  Changing the battery paramters DID make the issue go away.  However, immediately after that, I lost one of the cells in the 3S battery, so its dead.

When the new battery arrives in a few days, I will continue tweaking the battery parameters.  But it did have an effect.  I just want to be sure I set it to accurately show a low battery when it actually is low.

You adjusted the setting in QGC, right?

Do you mind sharing what those are? If it solves my issues as well, then we'll know that those settings are proper.

Cheers!

_M

Yes - I am not in front of QGC right now.  But the main things were setting the battery size to 5200mAh, and the scaling offsets were set to -1.0, which I changed to just 0.  I really don't know what to set them to, so just guessed.

I don't know why documentation is so hard to find for these things.  Maybe its out there somewhere, but I can't find anything on battery.

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