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Good cells vs Bad cells

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unitbngong
(@unitbngong)
Trusted Member Customer

Between the cells that become warm when charging with the ones that remain on normal temperature when charging. which ones are good?

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Topic starter Posted : 27/07/2021 6:17 pm
batFix
(@batfix)
Reputable Member

measure a couple parameters for start: - internal resistance (NLBA have a tab for that test, if you will install the cells into battery); - capacity from fully charged [4.2V and Ichrg < 50 mA] to total discharged [3.0V]

Lets Make NLBA Great ! Together.

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Posted : 27/07/2021 6:46 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator
Posted by: @unitbngong

Between the cells that become warm when charging with the ones that remain on normal temperature when charging. which ones are good?

Those which are warm is bad. Dont use it!

Those which cold are good.

 

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Posted : 27/07/2021 7:15 pm
unitbngong
(@unitbngong)
Trusted Member Customer

I have about 50 batteries on M37512= samsung PL0TC6A

7500mv/8850mAh

any help?

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Topic starter Posted : 30/07/2021 10:17 am
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

- Paste screenshot from the NLBA first page

- Paste picture of the chip or put here firmware marking code which starts with FC letters

 

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Posted : 30/07/2021 10:21 am
unitbngong
(@unitbngong)
Trusted Member Customer

It doesn not read completely i manage just to read the chip

Untitled

 

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Topic starter Posted : 30/07/2021 11:16 am
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

So it's M37512 with SDI firmware.

This chip is not supported to reset by Nlba plugin.

 

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Posted : 30/07/2021 11:32 am
DjiBattWorkshop
(@djibattworkshop)
Member Moderator
Posted by: @unitbngong

I have about 50 batteries on M37512= samsung PL0TC6A

Basing on previous topics me noticed you have good experience in cloning the batteries with different Pcbs. You could try same approach with these batteries. For example use bq20zXX pcb from any battery and connector from this Samsung battery. We could help you to reprogram Static Parameters to match Bios checks. It could be real challenge and useful experience to workaround  those m37512 hard nuts.

 

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Posted : 30/07/2021 12:10 pm
unitbngong
(@unitbngong)
Trusted Member Customer

i have thought of that but there is the big difference between 7.5v with 11.1v bq20zxxx 

 

still yet i tried samsung 11.1v/4400mAh/PB9NC6B but it power on the pc but it doesn't charge as the led keeps blinking red and yellow code even though i have not load a OS to really see.

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Topic starter Posted : 30/07/2021 12:25 pm
batFix
(@batfix)
Reputable Member
Posted by: @unitbngong

but it doesn't charge as the led keeps blinking red and yellow code even though i have not load a OS

It's a BIOS of the PC controlling the battery

Lets Make NLBA Great ! Together.

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Posted : 30/07/2021 12:47 pm
unitbngong
(@unitbngong)
Trusted Member Customer

@djibattworkshop do you mean i should connect a bq20zxxx on NLBA so you can remote program it to match with samsung 305U?

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Topic starter Posted : 30/07/2021 1:28 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator
Posted by: @unitbngong

there is the big difference between 7.5v with 11.1v bq20zxxx 

Yes, difference is big, but there is workaround.

- at HW side, connect a jumper wire from 2S to 3S cells connection points.

- at FW side, read EEPROM from the bq20zXX pcb, attach it here. Me will reprogram it to 2S configuration and return it back so you could upload modded dump to the Pcb.

 

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Posted : 30/07/2021 2:21 pm
unitbngong
(@unitbngong)
Trusted Member Customer

@djibattworkshop is it so?

DSC 0209

Sir

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Topic starter Posted : 30/07/2021 4:24 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

No, it looks like you shorted 1S and 3S points!

You should jump 2S and 3S instead.

They marked as VH and VP on the Pcb.

 

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Posted : 30/07/2021 4:35 pm
unitbngong
(@unitbngong)
Trusted Member Customer

@djibattworkshop done sir

Untitled

r

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Topic starter Posted : 30/07/2021 4:55 pm
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