New spark pilot incoming. And batteries.

[tomsmit09]

Hi everyone. Uncle gave me his spark as he only used it a dozen times in nearly 7 years of ownership.
One of the 3 batteries did end up charging on the hub but the other 2 have no luck.
I have done extensive research and have come across the cp2112 chip and the battery killer software, ordered the chip of eBay.

One battery is at ~3.15v per cell and the other at ~2.9v per cell. I’ve charged both batteries cells individually with a lab power supply and they are sitting around 11.35v.

Is the battery that was at 2.9 per cell damaged to a point where it looks like it’ll hold a voltage, but die straight away under load and have my spark fall out of the sky?

And I can only get around 10mins of flight time with the good battery landing with 15%. Is it normally this short?

I’m open for any tips, tricks, and precautions!

 

[SoccerRef12]

I think 10 minutes is about the limit on a battery, maybe a little more. Search this forum because I remember people have revived dead batteries or sent them to someone to have them revived. Good luck!

 

[Spark 317]

Hello from the Hoosier Heartland tomsmit09.

Welcome to the Forum.

.

 

[Echo-Tango-Juliet]

Welcome to the forum!

2.9 volts shouldn't be unrecoverable. Have you tried the 12-volt adapter hack? Pushing a burst of power from a 12-volt adapter into the cells can be enough to get the charger to recognize and slowly charge the battery.

10 mins of flight time using the good battery landing at 15% is a little on the low side but not to be concerned about. It's just a reality of using an older battery and it should still have a good 50-80 cycles left.

 

[tomsmit09]

Welcome to the forum!

2.9 volts shouldn't be unrecoverable. Have you tried the 12-volt adapter hack? Pushing a burst of power from a 12-volt adapter into the cells can be enough to get the charger to recognize and slowly charge the battery.

10 mins of flight time using the good battery landing at 15% is a little on the low side but not to be concerned about. It's just a reality of using an older battery and it should still have a good 50-80 cycles left.

The battery have locked themselves out with the pf flags, charger goes red in 3 seconds. I even made sure to see if they were trying to charge in the drone. I had my gator clips to a QC 3.0 cig socket to usb connected to my lab power supply. Only draws 105mA at 13v and battery leds 1 +2 flash like 3 or 4 times, stop and repeat. Good battery draws 800mA when charging.

I charged each cell individually to 3.300v and had them within 0.003 of each other then charged it at 11.45v at a rate of 250mA


Good battery had 17 cycles when I got it and now I’ve got it to 29.

Cp2112 will arrive in a few days so I can fix these other batteries