Hi all. My 3.7 kwh battery over-discharged in the garaged during storage. Charger won’t charge and connecting battery to the SP140 does nothing as well. Is there anyway to recover the battery or is it time for a new one.
Thank you!
Yah, read the voltage before BMS, what does it say?
Thank you for your reply, I’m assuming the battery has to be opened up to do that?
Hi, open the battery and push the only button on the BMS. I had the same problem and this trick did the job.
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That did it Pedroverticalo! Thank you!!
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What does this button do, reset? That allows the battery to function again.
In my case yes. Easy fix
Anyone have any pics of opening the battery?
Hi all,
I had a similar problem, but needed some extra steps.
Just a description of my experience of today. Maybe it can help some of you in the same situation.
situation :
I have (also) a 2.2KWh battery, which I do not use some much anymore for flying.
But I use it with an inverter to provide 220V electricity in my garden shed.
However, I forgot to turn off the light, … and when I looked at the battery (weeks later): no reaction.
I could not charge, not draw current from it, nor see it on the smart BMS app.
Measuring the output pins : 24V ! So Dead!
solution (for me at least it worked) :
I started opening the battery assembly.
After opening the side where the main wires come out ( 6 screws), you can see the BMS board, with the round bluetooth transmitter (flat button type).
As mentioned in this community topic, there was a button on it (see picture).
After pushing it various times (short, … long … ) I suddenly got connection with the smart bms app !!
Hope !!!
The BMS software indicated (see picture)
total voltage = 46V
min cell voltage = 1.544V
max cell voltage = 2.734V
So it was clear that the BMS refused to act !
With trial and errors, I managed to change the protection parameters in the settings :
cell volt low protect : 2.5V → 1.43V
sum volt low protect : 60V → 34V
diff volt protection : 0.8V → 1.40V
I also tried to toggle the active balance ‘balance switch’, but do not think this worked, nor had any influence.
I ended up with these cell low volt and diff protection values, to cope with the existing cell voltages, and because I think that the low volt protect needs to be higher than the diff volt protect (trial and error method).
And then suddenly (also tried to switch off and on the charger, pushed on the bluetooth button, … ) the batteries started charging !!!
Quite soon, the cell voltages became normal, and I did reset the protection parameters to the original ones. All back to normal.
I am aware that all assumptions here may not be fully correct, but at least it worked for me !
