did I just ruin my first Lipo?

[gomotomoto]

I have a 4s nanotech 5000mah 35-70c battery.

It was at 3.7 per cell and I was using it to calibrate in the assistant software. I did this with my 450 with similar voltage per cell but saw it was drawing next to nothing and was fine.

What I didn't realize is my 550 is chock full of stuff, h3-2d & a video tx as well as a bunch of heavy duty upgrade motors.

While in the assistant, a pop up showed up that said "low voltage" so I checked it. Seems I let it drain pretty good. This is what I see:

1. 2.29
2. 2.04
3. 2.57
4. 2.26

total voltage is 9.16

It's not warm or puffy.

Did I toast this battery? What should I do at this point?

Thanks all, hope I can save it.

 

[kloner]

totaly fried. What you'll notice if you can get a charger to charge it is the capacity will be less than expected and the ir is damaged so it'll sag pretty hard.... it'll degrade till you throw it out.....

 

[gomotomoto]

Bummer I was afraid of that. Weird cause I didn't think an idle 550 hooked to the assistant would draw that much. My 450 didn't draw much at all.

I have it in a LiPo bag, I assume it's not dangerous until I dispose of it?

I'll toss it out and be more cautious with discharging them.

Sent from my iPhone using Tapatalk

 

[kloner]

i can't say, i'd keep it on concrete where smoke won't hurt anything till you can drain it.... put it in a bucket of water with salt, it'll slowly drain over a period of a 3-5 days that will drain it empty, then it's ready to dispose in the trash....I usualy cut all the wires off at the same time just to make it look like it's not dangerous....

 

[gomotomoto]

Something weird is going on. Possibly a short? The battery drained out from 3.7 to the numbers listed above in about 30 minutes of idle power on the 550 hooked to the naza assistant on the bench. Is that possible? Nothing seemed wrong on the 550, I assume if it was a short the craft wouldn't power up with everything working. Too weird.

I hooked the battery up to a 12v auto bulb and the thing is dropping in voltage FAST. Is that normal? No puffing or smoking but to be safe I put it in a LiPo bag and put it in my outdoor fire pit in case it ignites.


Sent from my iPhone using Tapatalk

 

[kloner]

they usually blow when you charge,,,,

yes it does sound that way,,,, do you have a continuity meter? multimiter? start looking around, if you want to post some close up pics we are all glad to glance em over... whatever is draining should be pretty hot... feel around

 

[gomotomoto]

My FPV receiver was warm, but the led channels were lit up ok. Nothing was hot - (like burning hot). I do have a lot of led strips on the 550 maybe as it sat on the bench it just was drawing too much?

I have a multimeter.

I'll have to dispose of this one and order a new battery.

Sent from my iPhone using Tapatalk

 

[kloner]

you might check the amps going in and see.... a 500mw vtx based system idling uses .3-.4 amps,,,, a 1 watt will idle around .7 amps.... anything more and it's shorting out somewhere,,,, unplug the suspect, check again. it needs troubleshooting

 

[gomotomoto]

So dumb question. How would I use the multimeter to determine if something is pulling too much current on the battery? What am I looking for as far as a suspect draw?


Sent from my iPhone using Tapatalk

 

[gomotomoto]

have a feeling it just might be that vtx. Do those get warm while they idle?

My vtx is wired into my h3-2d for fpv. Wonder if I crossed something there. I doubt it though.. I was pretty careful following that diagram. So bummed if I have to tear it down.

I'm gonna need another battery before i can give it another look.


Sent from my iPhone using Tapatalk

 

[gomotomoto]

Light bulb just went off in my head! The vtx says it can work off of a 4s, but I bet jt can't handle it. Maybe needs a voltage regulator to take it down to 11.1 ? Sound like that might be it?


Sent from my iPhone using Tapatalk