My Mobula 7 drains a battery in about 10-30 seconds. I thought it was my batch of batteries so I ordered new ones and had the same issue. I did have an ELRS  receiver attached to it, but removed it along with the buzzer thinking one of them was causing a short/drain. Still having the same issue I replaced the PH2.0 plug, but that did not help. I found one of the motors not as free as the others, so I pulled it apart(small C clip!) and cleaned it good with electronic spray. Assembled it and the same issue happened. 

Is it time to buy a new Mobula 7 with ELRS or is there something else I should check?

Thanks,
Ed

What current indication do you get in OSD when flying?

What is the battery voltage before start and (say) five seconds after starting flight?

Have you got anytthing else to test the batteries on?

You could try removing two of the three wires from each motor, one motor at a time, or use the motor page in Configurator to run one motor at a time and monitor voltage sag.

It may be a bad batch of lipos but highly unlikely the entire set is bad.

There must be a short on the board or a defective component causing the excessive lipo drain.

It could be any component and should be heating up excessively.

If you plug in a lipo and touch the AIO board, any particular spot that’s getting hot to the touch fairly quickly?

Three motors draw .84-90 amps the forth one draws 1.00 amps. The motor that is using 1.00 amps also sounds different. The 1.00 amp motor is not the one that I pulled apart earlier. 

Aside from the VTX I don't feel much heat on the board, although it is still in the frame. 

The only other thing I can try the batteries in is my old mcpx helicopter, which is is not setup at the moment.

After running the motors on Betaflight and leaving them at 100% for a while during my amp draw test I decided to try and fly it again. Put my props back on, loaded a fresh battery and flew for about two minutes on a 380m battery. No idea how/why to started working again, but I will take the win and move on. 

Thanks for the help on this one. 
Ed

(03-Aug-2022, 11:39 PM)kafie1980 Wrote: It may be a bad batch of lipos but highly unlikely the entire set is bad.

There must be a short on the board or a defective component causing the excessive lipo drain.

It could be any component and should be heating up excessively.

If you plug in a lipo and touch the AIO board, any particular spot that’s getting hot to the touch fairly quickly?

Hi, I came here looking for battery issues with a Moblite7.
Reading your post about a component on the board heating up made me think I that direction.
I'm unable to check where exactly the heat is generated, but after my last flight, 1 minuted into an armed state (and flying around), suddenly I got a warning about the CPU overheating.
So I was wondering if you can give me some advice about this.
Can I use betaflight to figure something out or should I simply contact the manufacturer to have it replaced?
Thanks

Which version of Moblite7?

Frsky?
ELRS?

Analogue?
HDZero?
Walksnail?

My Mobula 7 is almost 5 years old, replaced the double PH2 plugs for solid pins about 4 years ago, and am still getting pushing 6 minutes on GnB 550s. Something's still not right.
Double check the batt wires are soldered solid, and no solder leaking over on something top & bottom. Unplug the motors & spray the cleaner on both plugs. I always do it anyway, but put the JESC 48kHz on the ESCs, and see if airtime improves. The Mobula always got great air time.

There have been quite a number of very different "Mobula 7"s over the years, with very different hardware.

OP states its a MobLITE 7. Not at all like your five year old one.  For starters its 1S ONLY.  The motors are soldered on, not plugs. Standard it has 1002 20000kV, with two blade 1610 props.

Even within the MobLITE 7 options there are significant differences, hence my as yet unanswered questions.  If its a HD version (mine is the HDZero) then even at only 25mW the VTX gets super hot super quickly if not immediately moving with enough airflow. If OP has this on 100 or 200mW then obviously that heating effect is amplified.  WHICH core temp is being warned?

I can see why I never paid much attention to it, not my type of setup.

Newest I have is the kitchen sink 1S board on the M6 HD, and haven't noticed any unusual heat off it, but thats a different board too. 

Is the problem not enough airflow, or 8 lbs of electronics on a 2lb board ???