Could it be because of fully charged cells? As the cells were manually charged, and now PCB detects some overvoltage or something. I really have no clue where to start. Maybe order of connecting wires also matters...

boby wrote on 2025-03-16, 09:41:

... There are 5 wires. Black ->negative, Red -> positive Two white ones also connected to positive side of cells and one yellow […]
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...
There are 5 wires.
Black ->negative, Red -> positive Two white ones also connected to positive side of cells and one yellow one connected to negative side of cells.

I soldered black & yellow to PCB but whenever I connect white to the place where it should go I get a bit of smoke. Tested with my meter I discovered that this connections on PCB is shorted (beeps) with red wire on PCB (I didn't solder red one yet).
...

"Red->Positive" "Two white also connected to positive"

(white wire)"connection on PCB is shorted with red wire on PCB"

I must be missing something - the first statement suggests that the Whites and Red are both connected to positive.
(ie: connected together)

but the second statements suggests that White wire being "shorted" to Red is a problem (and source of smoke)

??

DaveDDS wrote on 2025-03-18, 14:05:

"Red->Positive" "Two white also connected to positive" […]
Show full quote

boby wrote on 2025-03-16, 09:41:

... There are 5 wires. Black ->negative, Red -> positive Two white ones also connected to positive side of cells and one yellow […]
Show full quote

...
There are 5 wires.
Black ->negative, Red -> positive Two white ones also connected to positive side of cells and one yellow one connected to negative side of cells.

I soldered black & yellow to PCB but whenever I connect white to the place where it should go I get a bit of smoke. Tested with my meter I discovered that this connections on PCB is shorted (beeps) with red wire on PCB (I didn't solder red one yet).
...

"Red->Positive" "Two white also connected to positive"

(white wire)"connection on PCB is shorted with red wire on PCB"

I must be missing something - the first statement suggests that the Whites and Red are both connected to positive.
(ie: connected together)

but the second statements suggests that White wire being "shorted" to Red is a problem (and source of smoke)

??

Yes maybe my explanation is not so good. Let me try again. There are 5 wires connecting PCB and cells. Cells are ordered one bellow each other. Red wire is connected to positive pole of a cell 7. Black wire is connected to negative pole od cell 1. Yellow wire is connected to negative pole of cell 3. Short white wire is connected to positive pole of cell 4. White wire is connected to positive pole of cell 6.

I did following:
Soldered yellow and black one on PCB to their respective places. When I conected short white wire on it's place I got smoke. I tried with my multimeter red wire connection point (no wire soldered) and short white wire point (no wire soldered) and those were shorted.

Voltage between red and black wire is 16.66 V
Voltage between short white and black wire is 8.31V

Ok, it looks like calls 1+2 are in parallel, 3+4 are in parallel, 5+6 are in parallel and 7+8 are in parallel

main power draws from the ends of 1+2 and 7+8 that are not connected to other cells.
this is effectively the same 4 higher-current cells in series.

The yellow and white wires are monitoring points where the cells connect in series, mainly to confirm that
they are all charging the same amount - depending on the sophistication of the charging circuit they may
be used to help bring them in line by causing more charge current to sets that are low.

These three should only be connected to the mid-points of the cell series, and some
internal measuring circuitry - obviously in this case the PCB circuitry is drawing a lot of power
from these mid points - enough to cause smoke means enough to damage things.

With the "battery" disconnected, these should be drawing essentially no current.

What I'd probably do to try and figure out why it's drawing current is to hook the wires up with some
current limiting resistors (I'd prob. start with 1k or 500 ohms - but you might have to adjust to get good
readings) and probe the circuit to see where the battery voltage is being dropped.

Well, I don't have such things on a hand, like current limiting resistors. I would like to try to find schematic for this PCB to see which wire is what, but not sure if possible and how.

Maybe one point here worth of mentioning. So PCB points, for red and white wire, are shorted only when black and yellow is connected to the PCB. When I remove all wires, nothing is shorted anymore (checking PCB alone)

I went looking around a bit and stumbled upon this https://www.laptopu.ro/community/pinouts-for- … pp2061e-series/

Which kinda indicates that there are many different revisions of the battery pcb. 😒

Could you give the partnumber of the battery, that might make it easier to search & find a good match or identical to one as yours .
partnumber is something like 166355-002 ie 6 digits bar 3 digits

oh yeah, I see that BC1 is ground, and BC5 is positive , so I'd assume BC2 which I don't see on the other photos is the positive of the first two parallel batteries, bc2 the second, and bc4 the third. but without those BCx designations, that seems moot.

weedeewee wrote on 2025-03-18, 18:34:

I went looking around a bit and stumbled upon this https://www.laptopu.ro/community/pinouts-for- … pp2061e-series/ […]
Show full quote

I went looking around a bit and stumbled upon this https://www.laptopu.ro/community/pinouts-for- … pp2061e-series/

Which kinda indicates that there are many different revisions of the battery pcb. 😒

Could you give the partnumber of the battery, that might make it easier to search & find a good match or identical to one as yours .
partnumber is something like 166355-002 ie 6 digits bar 3 digits

oh yeah, I see that BC1 is ground, and BC5 is positive , so I'd assume BC2 which I don't see on the other photos is the positive of the first two parallel batteries, bc2 the second, and bc4 the third. but without those BCx indications, that seems moot.

I can see following:

• 1-682-895-11

• 1-682-894-11 (differs in one digit only ?)

• LIP810IVPT

boby wrote on 2025-03-18, 18:42:

I can see following: […]
Show full quote

weedeewee wrote on 2025-03-18, 18:34:

I went looking around a bit and stumbled upon this https://www.laptopu.ro/community/pinouts-for- … pp2061e-series/ […]
Show full quote

I went looking around a bit and stumbled upon this https://www.laptopu.ro/community/pinouts-for- … pp2061e-series/

Which kinda indicates that there are many different revisions of the battery pcb. 😒

Could you give the partnumber of the battery, that might make it easier to search & find a good match or identical to one as yours .
partnumber is something like 166355-002 ie 6 digits bar 3 digits

oh yeah, I see that BC1 is ground, and BC5 is positive , so I'd assume BC2 which I don't see on the other photos is the positive of the first two parallel batteries, bc2 the second, and bc4 the third. but without those BCx indications, that seems moot.

I can see following:

• 1-682-895-11

• 1-682-894-11 (differs in one digit only ?)

• LIP810IVPT

that makes me think it's not a genuine compaq battery, a third party one, which will likely complicate the resolution of your conundrum.

weedeewee wrote on 2025-03-18, 19:05:

boby wrote on 2025-03-18, 18:42:

I can see following: […]
Show full quote

weedeewee wrote on 2025-03-18, 18:34:

I went looking around a bit and stumbled upon this https://www.laptopu.ro/community/pinouts-for- … pp2061e-series/ […]
Show full quote

I went looking around a bit and stumbled upon this https://www.laptopu.ro/community/pinouts-for- … pp2061e-series/

Which kinda indicates that there are many different revisions of the battery pcb. 😒

Could you give the partnumber of the battery, that might make it easier to search & find a good match or identical to one as yours .
partnumber is something like 166355-002 ie 6 digits bar 3 digits

oh yeah, I see that BC1 is ground, and BC5 is positive , so I'd assume BC2 which I don't see on the other photos is the positive of the first two parallel batteries, bc2 the second, and bc4 the third. but without those BCx indications, that seems moot.

I can see following:

• 1-682-895-11

• 1-682-894-11 (differs in one digit only ?)

• LIP810IVPT

that makes me think it's not a genuine compaq battery, a third party one, which will likely complicate the resolution of your conundrum.

It might be, but I assume at some point this battery was working in this laptop, so should be fine.

boby wrote on 2025-03-18, 19:16:

weedeewee wrote on 2025-03-18, 19:05:

boby wrote on 2025-03-18, 18:42:

I can see following: […]
Show full quote

I can see following:

• 1-682-895-11

• 1-682-894-11 (differs in one digit only ?)

• LIP810IVPT

that makes me think it's not a genuine compaq battery, a third party one, which will likely complicate the resolution of your conundrum.

It might be, but I assume at some point this battery was working in this laptop, so should be fine.

So it's 261449-001 . It's right there on the photo of the label.
Where did you get the other numbers from ? doesn't matter though.

weedeewee wrote on 2025-03-18, 19:49:

boby wrote on 2025-03-18, 19:16:

weedeewee wrote on 2025-03-18, 19:05:

that makes me think it's not a genuine compaq battery, a third party one, which will likely complicate the resolution of your conundrum.

It might be, but I assume at some point this battery was working in this laptop, so should be fine.

So it's 261449-001 . It's right there on the photo of the label.
Where did you get the other numbers from ? doesn't matter though.

Ah sorry, you wanted a part number! I took some numbers from PCB

any mention on the pcb of BC2 BC3 or BC4 ?

weedeewee wrote on 2025-03-18, 19:54:

any mention on the pcb of BC2 BC3 or BC4 ?

Only BC1 next to black wire connection and BC5 next to red wire connection, as I can see.

Ok, I was very stupid. I swapped black and red wire on my schema so now everything is working fine, and the battery is charging in the laptop 😀