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DJI Mavi Pro battery reset using CP2112 and DJI battery killer

Domz84

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Joined
Jan 8, 2024
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Age
39
Location
Australia
Good Afternoon/Morning,

Having issues getting one of my batteries to charge which was in long term storage and won't turn on or accept any charge. Removed the casing and manually charged the battery to 11.8 volts ( 2 cells had no charge and one had 2.6 volts) and holding, all 3 cells are 3.9 volts each.

I have a cp2112 and got it communicating with the DJI battery killer app, i can unseal, clear PF and reset but the battery still fails to turn on, done some more research and found 2 write word codes 00 0024 and 00 0029 which write successfully but still not turning on.

is there any other commands that need to be sent?

Have attached screenshots.
Screenshot 2024-01-08 164201.pngScreenshot 2024-01-08 164023.png
 
@Domz84 i mean no offence, but the only command i would send to that battery, is by by time to go to be disposed of and replaced
 
A LiPo allowed to fall below 3.0V will sustain permanent damage... the effect of this damage is a increased internal resistance which in turn will generate excessive heat during both charge & discharge. Another even more serious effect is that lithium metal starts to plate out on the anode. This causes dendrite structures to form, which can puncture the separator, causing an internal short-circuit.

If looking at the span between 0V & 3.0V, the amount of damage (increased internal resistance) isn't linear, a battery on 1.0V is far worse than a battery on 2,5V... & one on 0V is far worse than one on 1.0V.

Most chargers will not charge LiPo's lower than 2,5V... the reason for this is that, the higher the internal resistance is, the greater the risk is for that the battery goes up in flames due to the heat generated from the higher internal resistance during the charge cycle.

It's possible to bring back a LiPo above 3.0V which only have a couple of mV, this by charging with a very very low current. BUT this will not in any way revert the damage that the battery sustained by being allowed to fall below 3.0V... the increased internal resistance & the dendrite structures on the anode will remain.

This damaged battery will onward pose a serious threat if you continue to use it...

1. The internal resistance will make that battery very prone to major voltage drops during amp draw, which increases the risk for it to again drop below 3.0V where a DJI drone initiate a forced auto landing.

2. Further more, the extra heat generation most probably soon make the battery swell as the heat will increase the electrolyte decomposition which generates gasses.

3. This battery will continue to be prone to catch fire during use, especially during charging... & from a very high risk of internal short-circuits.

You will never ever be able to trust this battery again... my advise is to dispose of it in a proper way asap.
 
Last edited:
I took the, apart found the good cells and use it for an atv battery works good actually two mavic pro batteries equivilent will spin the starter pretty fast on a suziki 250 quad they wont go back into the aircraft again for sure
 
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A LiPo allowed to fall below 3.0V will sustain permanent damage... the effect of this damage is a increased internal resistance which in turn will generate excessive heat during both charge & discharge. Another even more serious effect is that lithium metal starts to plate out on the anode. This causes dendrite structures to form, which can puncture the separator, causing an internal short-circuit.

If looking at the span between 0V & 3.0V, the amount of damage (increased internal resistance) isn't linear, a battery on 1.0V is far worse than a battery on 2,5V... & one on 0V is far worse than one on 1.0V.

Most chargers will not charge LiPo's lower than 2,5V... the reason for this is that, the higher the internal resistance is, the greater the risk is for that the battery goes up in flames due to the heat generated from the higher internal resistance during the charge cycle.

It's possible to bring back a LiPo above 3.0V which only have a couple of mV, this by charging with a very very low current. BUT this will not in any way revert the damage that the battery sustained by being allowed to fall below 3.0V... the increased internal resistance & the dendrite structures on the anode will remain.

This damaged battery will onward pose a serious threat if you continue to use it...

1. The internal resistance will make that battery very prone to major voltage drops during amp draw, which increases the risk for it to again drop below 3.0V where a DJI drone initiate a forced auto landing.

2. Further more, the extra heat generation most probably soon make the battery swell as the heat will increase the electrolyte decomposition which generates gasses.

3. This battery will continue to be prone to catch fire during use, especially during charging... & from a very high risk of internal short-circuits.

You will never ever be able to trust this battery again... my advise is to dispose of it in a proper way asap.

A LiPo allowed to fall below 3.0V will sustain permanent damage... the effect of this damage is a increased internal resistance which in turn will generate excessive heat during both charge & discharge. Another even more serious effect is that lithium metal starts to plate out on the anode. This causes dendrite structures to form, which can puncture the separator, causing an internal short-circuit.

If looking at the span between 0V & 3.0V, the amount of damage (increased internal resistance) isn't linear, a battery on 1.0V is far worse than a battery on 2,5V... & one on 0V is far worse than one on 1.0V.

Most chargers will not charge LiPo's lower than 2,5V... the reason for this is that, the higher the internal resistance is, the greater the risk is for that the battery goes up in flames due to the heat generated from the higher internal resistance during the charge cycle.

It's possible to bring back a LiPo above 3.0V which only have a couple of mV, this by charging with a very very low current. BUT this will not in any way revert the damage that the battery sustained by being allowed to fall below 3.0V... the increased internal resistance & the dendrite structures on the anode will remain.

This damaged battery will onward pose a serious threat if you continue to use it...

1. The internal resistance will make that battery very prone to major voltage drops during amp draw, which increases the risk for it to again drop below 3.0V where a DJI drone initiate a forced auto landing.

2. Further more, the extra heat generation most probably soon make the battery swell as the heat will increase the electrolyte decomposition which generates gasses.

3. This battery will continue to be prone to catch fire during use, especially during charging... & from a very high risk of internal short-circuits.

You will never ever be able to trust this battery again... my advise is to dispose of it in a proper way asap.
Thank you for your input, will purchase a replacement battery.
 
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