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[Solved] Lenovo LNV-45N1071 -BQ20695A TI V7.08 Remaining capacity

Fogonazo
(@ventas)
Noble Member Customer
image

I have recelled, and updated FCC.

When charging battery remaining capacity was rising normally, but when battery was charged instead of being equal to FCC it set to around half of FCC. (1266mAH instead of 2500 mah) while before getting copletely charged remaining capacity was higher (around 2300 mah)

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Topic starter Posted : 03/01/2025 6:47 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

 It looks like chip firmware bug. 

 Cells are fully charged but RSoC is just 51% on the picture. 

 Set 16800 on BatInfo page, press PowerOn and wait until it reachs 100. 

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Posted : 03/01/2025 7:40 pm
Fogonazo
(@ventas)
Noble Member Customer

I have already done this, without success. It seems like when cells get to full charge RSoC sets to 51% instead of 100%

 

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Topic starter Posted : 03/01/2025 9:00 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

send this command 

RBL 37 

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Posted : 03/01/2025 10:39 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator
Posted by: @ventas

It seems like when cells get to full charge RSoC sets to 51% instead of 100

 So it is chip firmware bug. 

 Lenovo officially confirmed it in service letter. 

IMG 20250104 004416
IMG 20250104 004240

 They also released battery firmware update utility to fix the issue. 

 It could be downloaded from Lenovo support website 

https://support.lenovo.com/us/en/downloads/ds001322-lenovo-battery-firmware-update-utility-for-windows-10-81-8-7-vista-32-bit-64-bit-xp-thinkpad  

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Posted : 03/01/2025 10:47 pm
Fogonazo liked
Fogonazo
(@ventas)
Noble Member Customer

@djibattworkshop Thanks for the info. I do not have the laptop, I will tell the customer to do it by himself. In case I get the battery back again I will save corrected EEPROM

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Topic starter Posted : 03/01/2025 11:27 pm
Fogonazo
(@ventas)
Noble Member Customer

@djibattworkshop

RBL 37 0500240000011000

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Topic starter Posted : 04/01/2025 12:32 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

 will check if there is updated eeprom 

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Posted : 04/01/2025 12:55 pm
Fogonazo liked
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

send me also dump from your battery to check differences 

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Posted : 04/01/2025 10:40 pm
Fogonazo liked
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

 found some eeproms from this battery, try it one by one and check if the issue persists 

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Posted : 06/01/2025 2:50 pm
Fogonazo liked
Fogonazo
(@ventas)
Noble Member Customer

@djibattworkshop 

FiX1 worked for me, I have not try fix2

 

image

 

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Topic starter Posted : 06/01/2025 4:58 pm
Fogonazo
(@ventas)
Noble Member Customer
image

I have also reset cycles and change FCC to my new cells (2500 mah)

Thanks!

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Topic starter Posted : 06/01/2025 5:01 pm
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