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Repairing / Unlocking Lenovo T400, T60, T61 batteries 42T5262

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Paddy
(@paddy)
Active Member Customer

We have quite a lot of Lenovo batteries to suit the T60, T61 and T400 laptops (42T5262). These are quite old and we are manually charging them up using a bench PSU and that end of things is working fine.

The BIOS chips are reading unlocked for charging too however when i try to charge using the analyser we get no current flowing into the batteries, they are acting as if they are locked.

Ive seen some people mention that the BMS sometimes needs a jump start on these by attaching the battery output terminal to the positive on the cells and when doing this with the analyser we noticed that the battery started drawing current and state of charge began to increase.(its the blue cable in our picture)

As soon as we remove this cable the current stops flowing like a locked battery.

When we perform a cell check we get the message the battery has communication but is locked for charging, but the lock status shows its not locked.

Another peculiar thing we noticed was when we went into the reset part of the program the unseal/boot section is greyed out and not clickable.

 

 

 

Repair Lenovo battery T60 T61 T400 42T5262 NLBA1 device scaled
This topic was modified 3 months ago 2 times by Nicusor
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Topic starter Posted : 21/07/2021 1:13 pm
Paddy
(@paddy)
Active Member Customer

Here is the charging screen with blue cable attached

 20210721 141015
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Topic starter Posted : 21/07/2021 1:14 pm
Paddy
(@paddy)
Active Member Customer

Here is the charging status with the blue cable removed.

No current flowing and it doesnt detect the state of charge from previous charging.

 20210721 141927
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Topic starter Posted : 21/07/2021 1:20 pm
Paddy
(@paddy)
Active Member Customer

And here is the battery info

 20210721 142152
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Topic starter Posted : 21/07/2021 1:23 pm
DjiBattWorkshop
(@djibattworkshop)
Member Moderator

Could you check the fuse on the battery pcb?

 

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Posted : 21/07/2021 1:45 pm
Paddy
(@paddy)
Active Member Customer

I've a few of these batteries out of the cartridges for testing and when I bell the fuses using the multimeter they're both working.

repair laptop battery fuse 12AH3 scaled
This post was modified 3 months ago by Nicusor
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Topic starter Posted : 21/07/2021 2:32 pm
Paddy
(@paddy)
Active Member Customer

Ive tried pulling the cap off the fuse as well and it looks intact apart from my screwdriver marks.

good battery fuse 12AH3
This post was modified 3 months ago by Nicusor
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Topic starter Posted : 21/07/2021 2:45 pm
Nicusor
(@azzido)
Member Admin
Posted by: @paddy

Another peculiar thing we noticed was when we went into the reset part of the program the unseal/boot section is greyed out and not clickable.

Unseal button for BQ8030 is deactivated since the operation is done in background by the other buttons.

Did you clear the errors, right ?

If you connect the battery to NLBA1 device, is the Output LED on ?

NLBA Laptop Battery Analyzer with Chip Reset & Repair Option

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Posted : 21/07/2021 3:11 pm
batFix
(@batfix)
Reputable Member

@paddy 

Just little tidbit:

to make clean and good readable snapshot of the SW, you could make a couple actions: press ALT+PrtScrn, run MSpaint, C&P there, then save it as a JPG file. Then Attach the file to your message. 👍 👍 👍 👍 👍 👍 

Lets Make NLBA Great ! Together.

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Posted : 21/07/2021 4:05 pm
Paddy
(@paddy)
Active Member Customer

@azzido 

to confuse matters further i cleared the fault codes but didnt try charging via the analyser this time, instead putting it into a laptop and it has started charging.

 

@batfix 

thanks for the info but im jumping between computers in the warehouse for the analyser and the office

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Topic starter Posted : 21/07/2021 4:19 pm
batFix
(@batfix)
Reputable Member
Posted by: @paddy

thanks for the info but im jumping between computers in the warehouse for the analyser and the office

Use "sneaker mail" - floppy 😉 or USB thumb drive 👍 

Lets Make NLBA Great ! Together.

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Posted : 21/07/2021 4:32 pm
Nicusor
(@azzido)
Member Admin

@paddy 

news ?

NLBA Laptop Battery Analyzer with Chip Reset & Repair Option

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Posted : 22/07/2021 4:11 pm
razvanu
(@marsotica)
Active Member Customer

How to unlock this battery ? PN:42T5265

Screenshot 2021 10 10 080430

 

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Posted : 10/10/2021 5:22 am
razvanu
(@marsotica)
Active Member Customer
Screenshot 2021 10 10 133423

still nothing, i can not by pass the fuse , no voltage to output pins

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Posted : 10/10/2021 10:37 am
Nicusor
(@azzido)
Member Admin

@marsotica 

You need to open a dedicated topic for your issue.

NLBA Laptop Battery Analyzer with Chip Reset & Repair Option

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Posted : 11/10/2021 8:32 am
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