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Mavic Pro Battery will not unseal. Code 28

macjax
(@macjax)
Active Member Customer

Hello. I am getting an error code 28 while trying to unseal a DJI Mavic Pro battery. Any ideas ? 

Thanks !!

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Topic starter Posted : 18/01/2023 10:38 pm
macjax
(@macjax)
Active Member Customer

I just kept pressing "Unseal / Boot" and it finally unsealed. Any ideas why it doesn't work most of the time ?

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Topic starter Posted : 19/01/2023 3:49 am
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

Because MSP430 was not isolated from SMBUS. It serves as main master, nlba1 serves as secondary master, bq30z55 serves as a slave. So in the multimaster environment there is big probability of interference and packet collision because both masters talk with a slave at the same time. 

 

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Posted : 19/01/2023 3:10 pm
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macjax
(@macjax)
Active Member Customer

@djibattworkshop thanks you ! Makes sense. Is there a work around ? Should I just keep trying to unseal until it works. 

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Topic starter Posted : 19/01/2023 3:54 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

Which hardware was used to work with a battery, ev2300, ev2400 or Nlba1?

Was battery switched ON or OFF by push-button before Unseal?

Does any LED blink while Unseal try ? 

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Posted : 19/01/2023 5:50 pm
macjax
(@macjax)
Active Member Customer

@djibattworkshop thanks for the reply. I am using the EV2400. I don’t think any LEDS came on when trying to unseal. It was locked out from power on. I might have tried to turn it on to see if that would help unseal it but it didn’t. 

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Topic starter Posted : 21/01/2023 8:41 am
Nicusor
(@azzido)
Member Admin

@macjax 

Repeat the unsealing many times until the software finds a free slot on the bus.

NLBA Laptop Battery Analyzer with Chip Reset & Repair Option

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Posted : 23/01/2023 8:11 am
macjax liked
DjiBattWorkshop
(@djibattworkshop)
Member Moderator
Posted by: @macjax

I don’t think any LEDS came on when trying to unseal. It was locked out from power on

 Dji Mavic Pro batteries based on msp430 mcu, and it allows to press Power On button and to switch On the LEDs even in the Locked state. Not to be confused with Dji Mavic Pro 2 battery where chip is different and does not allow to check LEDs when Locked. 

Posted by: @macjax

I might have tried to turn it on to see if that would help unseal

 It is poor practice. Switching the battery On by push button will activate msp430 which serves as main smbus master and could cause conflicts on the bus and interfere unsealing. 

 Battery should be Off by push-button before unseal. No LEDs should be lit. 

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Posted : 23/01/2023 12:50 pm
macjax liked
macjax
(@macjax)
Active Member Customer

@djibattworkshop yes. That’s how I initially had it and only turned it on because it wouldn’t unseal. Good to know this info though. I have another battery that I’m going to try and see what happens. Thank you for the reply. 

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Topic starter Posted : 23/01/2023 4:42 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

If you got issues with unsealing, measure the voltages on SCL, SDA pins relating to GND and post a values. 

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Posted : 23/01/2023 4:57 pm
macjax liked
ahmedshady
(@ahmedshady)
New Member
17088998299832359119861450074045
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Posted : 25/02/2024 10:24 pm
ahmedshady
(@ahmedshady)
New Member

Scl value=2,6 v

Sda value =2,6 v

 

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Posted : 25/02/2024 10:28 pm
ahmedshady
(@ahmedshady)
New Member
17089004101563410652127499889780
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Posted : 25/02/2024 10:33 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

 Create new topic and describe the issue. 

 Dont use smartphone to take a picture of the software. It is not allowed on the forum. 

There is a button to do it. 

NLBA1 Snapshot button

 

 

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Posted : 27/02/2024 11:47 am
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