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Acer Aspire 1640 Battery: Worth Replacing Cells or Resetting Electronics?

TOMSON 8979 24
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Is it worth replacing the cells in an Acer Aspire 1640 laptop battery and resetting the electronics, or is the fault more likely in the cells than the controller?

Yes — the cells are the more likely problem, and replacing them is more worthwhile than only resetting the electronics. Even if the no-load voltage looks normal, old cells can have enough internal resistance that the controller blocks the pack, so a load test is needed to confirm this [#14258012] A controller reset only restores factory/default settings and does not guarantee the battery will work; after cell replacement, the values still need to be set manually and the pack calibrated [#14268527][#14269929] The thread also warns that using the wrong BQ utility is risky because the BQ2084 program can see the BQ80201 but does not fully support it [#14274158] In the end, the battery was repaired by replacing the cells and setting the parameters with TI software, and it worked for about 2.5 hours on Panasonic 3400 mAh cells [#14275753][#14329818]
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  • #1 14257688
    TOMSON
    Level 19  
    Posts: 458
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    I have batteries from my used Acer Aspire 1640 laptop it has been years old.
    Most of the time, the laptop did not run with the battery or it worked for a few minutes, it was used on the power supply only.
    After disassembling the battery, I checked the voltages on individual cells without load, differing only by a pair of mV and oscillated at 4V. When positive attempt to turn on the laptop screams immediately with the battery discharged.
    Another voltage measurement on the cells is about 3.97V on the cell.
    I read BE2Works demo information about cells in the battery.

    Acer Aspire 1640 Battery: Worth Replacing Cells or Resetting Electronics?

    The heart of the system are bq29312PW and bq80201DBT

    Acer Aspire 1640 Battery: Worth Replacing Cells or Resetting Electronics?

    Acer Aspire 1640 Battery: Worth Replacing Cells or Resetting Electronics?

    Is it meaningful to exchange links for new ones and reset the electronics because I do not know if the fault lies to the end on the side of links or electronics
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  • #2 14258012
    Wiesław Rzepka

    Level 32  
    Posts: 1620
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    Sony's battery for bq80201, correctly calculates the efficiency of cells. After a few years the links, despite such reading as shown in BatMon, have so much internal resistance that the controller blocks the battery operation. It is also possible a large number of battery charging cycles, but in my opinion you need to replace the cells. You can make an attempt - load a packet of cells with a light bulb as described many times on the forum and write what measurement results without load and which under load.
    Company Account:
    Serwis T-W
    pl. Bema 6, Tarnów, 33-100 | Company Website: www.re-comp.pl
  • #3 14258754
    TOMSON
    Level 19  
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    I unloaded the cells with 0.7-0.8A current after sucking 0.8Ah of voltage on targets under load counting cells from ground.
    1) 3.037V; 2) 3.34V; 3) 3.36V; 4) 3.26V
    the temperature of the cells has increased to 32 ° C

    No load after unloading:
    1) 3.68V; 2) 3.72V; 3) 3.72V; 4) 3.72V

    also total cell thread

    I have a Panasonic NCR18650B cell but have a larger capacity of 3400mAh 3.6V
    could they cooperate with the battery electronics after modifying the settings in the BQ system
    After studying a few posts, I tried to read the eeprom as BQ208X
    Be2Works in the demo version and succeeded :)

    Acer Aspire 1640 Battery: Worth Replacing Cells or Resetting Electronics?

    I saved the batch on the disk and whether this batch can be modified to
    owned by PANASONIC.

    I have an EV2300 interface and whether to save the batch to the system can only be a full version of the Be2Works program
  • #4 14259693
    Wiesław Rzepka

    Level 32  
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    Of course, only flash changes are needed.
    Company Account:
    Serwis T-W
    pl. Bema 6, Tarnów, 33-100 | Company Website: www.re-comp.pl
  • #5 14259994
    TOMSON
    Level 19  
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    I attach the saved battery batch for inspection
    Attachments:
    • bat_rafa__.bin (384 Bytes) You must be logged in to download this attachment.
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  • #6 14260473
    Wiesław Rzepka

    Level 32  
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    Please wait. I am in the middle of urgent work.

    Added after 30 [minutes]:

    be2w demo version will not save you a new flashcamp. I have a 3.28 Cavite version, it supports Sony but only with the bq8030 controller. I can change the data in bq80201, but it has to be read full flash and saved in the srec or senc file. Nothing else can be done at a distance.
    Company Account:
    Serwis T-W
    pl. Bema 6, Tarnów, 33-100 | Company Website: www.re-comp.pl
  • #7 14262159
    TOMSON
    Level 19  
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    Can this BQ system be read and written on the interface version after LPT because this program with the license for 24 hours is only available under the version for the LPT interface, probably only. How do I put an interface on LPT?
  • #8 14264340
    Wiesław Rzepka

    Level 32  
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    The LPT version is as I remember 2.87 and this is the last one on LPT. It does not support bq8030 or bq80201. Only the new Bohole version 4.20 has changed something, but since I do not have it, I can not check it. In fact, only Sony Tools and the vietnam program directly support bq80201 sony.
    Company Account:
    Serwis T-W
    pl. Bema 6, Tarnów, 33-100 | Company Website: www.re-comp.pl
  • #9 14264882
    TOMSON
    Level 19  
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    As if the EV2300 version was available for 24h, I would try to try it because I only see LPT versions on the website and the new full program goes almost 835 PLN.

    4.15 18/07/2013
    BQ80201 SONY firmware added.
    Better reading and writing with EV2300 and EV2400 adapters. as you can see from version 4.15, it is already supported.
  • #10 14265269
    Wiesław Rzepka

    Level 32  
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    Yes, I have not looked at the be2w website for a long time.
    But these versions (as I wrote from version 2.87 which I have) are only under ev2300.
    Company Account:
    Serwis T-W
    pl. Bema 6, Tarnów, 33-100 | Company Website: www.re-comp.pl
  • #11 14268468
    TOMSON
    Level 19  
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    I installed a program for the BQ2084 system from the TI website and managed to read the laptop battery so I put the photos together.
    Acer Aspire 1640 Battery: Worth Replacing Cells or Resetting Electronics?

    Acer Aspire 1640 Battery: Worth Replacing Cells or Resetting Electronics?

    in the advanced settings is it possible to reset the system, or what to clear all the battery settings?
  • #12 14268527
    Wiesław Rzepka

    Level 32  
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    The Reset bq option restores the controller's factory settings.
    Company Account:
    Serwis T-W
    pl. Bema 6, Tarnów, 33-100 | Company Website: www.re-comp.pl
  • #13 14268679
    krzychu1985^

    Level 28  
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    It seemed to me that the reset option will restart the battery, inter alia it will block again (it will set itself to sealed status). If you have these 3400mAh cells, set in flash: design capacity 3400mAh, full charge capacity 3400mAh, remaining capacity 340mAh, cycle count threshold 3060mAh, cycle count on 0 or 1 and the battery should work. Save the original flash before the changes.
    Company Account:
    Krzysztof Łukasik LukasKomp
    Elizy Orzeszkowej, Ostrzeszów, 63-500
  • #14 14269186
    TOMSON
    Level 19  
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    As part of the experiment, I changed the read value full charge capacity
    65511mAh at 1900mAh and the link theoretically regained efficiency in the program
    RelativeSOC: 7% changed to 100% and AbsoluteSOC: 228% changed to 94%. Charges the charger to see how much capacity they have.
    Charging set to 1A the voltage started to grow quickly, i.e. the links have a high internal resistance, I have reduced the current to 0.5A.
    after controlling 280mAh, the voltage on the cell is already 16.22V
  • #15 14269425
    krzychu1985^

    Level 28  
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    It is a waste of time on these links. Maybe 196 cycles are not so much, but the age of links is also important, and these do not belong to the young.
    Company Account:
    Krzysztof Łukasik LukasKomp
    Elizy Orzeszkowej, Ostrzeszów, 63-500
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  • #16 14269501
    TOMSON
    Level 19  
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    Have you changed any parameters in the TI to BQ2084 program in the cell configuration.
  • #17 14269929
    Wiesław Rzepka

    Level 32  
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    Krzysiek, this reset option sets the default parameters, but not necessarily the battery will work after this operation. It is always better to manually set the values that we want.

    Added after 5 [minutes]:

    And so the most important is the calibration of the battery. If after the reset the capacity does not "jump" by itself to the right value, the battery will never calibrate even after several calibrations.
    Company Account:
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  • #18 14270062
    TOMSON
    Level 19  
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    In the battery I was charging 975mAh charger and this value I entered into the battery is SOC came out to me 21%

    Acer Aspire 1640 Battery: Worth Replacing Cells or Resetting Electronics?

    The SOC parameter system calculates on the basis of the charge charged and discharged from the cell, I will also see how it will change when using the laptop
  • #19 14272126
    TOMSON
    Level 19  
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    I replaced the batteries with a new one but the system went silent with no communication on the laptop's pins, which was the BAT + voltage and now there is no problem with the system.
    I soldered the wires from plus to minus and soldered back from minus to plus
  • #20 14272340
    Wiesław Rzepka

    Level 32  
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    You connected correctly. Check the fuse.
    Company Account:
    Serwis T-W
    pl. Bema 6, Tarnów, 33-100 | Company Website: www.re-comp.pl
  • #21 14272385
    TOMSON
    Level 19  
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    measurement on the fuse in the horizontal plane is 13.9? and in vertical 0.2? the fuse type is 12Ah4
    Or maybe the system went to sleep.
    The voltage on the fuse is the same as on 14.56V cells
    Maybe now the battery needs to wake up on the BQ2084 application is pin sys pres but this is BQ80201 but it is seen as BQ2084
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  • #22 14274158
    Wiesław Rzepka

    Level 32  
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    The program for bq2084 sees bq 80201 but does not support it. For sure, the memory map is different. Entering data in cells is therefore risky.
    Company Account:
    Serwis T-W
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  • #23 14275480
    TOMSON
    Level 19  
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    The battery was peeling and improved and it started working on new batteries.
    It could be read again with the TI to BQ2084 program and the voltage appeared on the terminals
  • #24 14275753
    Wiesław Rzepka

    Level 32  
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    Well, just enjoy it. You've fixed your battery.
    Company Account:
    Serwis T-W
    pl. Bema 6, Tarnów, 33-100 | Company Website: www.re-comp.pl
  • #25 14329818
    TOMSON
    Level 19  
    Posts: 458
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    Rate: 40
    I close the topic

    With the help of the program from the TI website, it was possible to set parameters for the BQ2084 system after the exchange of cells and the battery on the panasonic 3400mAh cells works 2.5 hours
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Topic summary

✨ The discussion revolves around the feasibility of replacing cells in an Acer Aspire 1640 battery versus resetting its electronics. The user reports that the laptop primarily operates on power supply, with the battery showing minimal voltage under load. Various responses suggest that the internal resistance of the old cells may be too high, leading to the controller blocking battery operation. Recommendations include testing the cells under load, replacing them with new Panasonic NCR18650B cells, and modifying settings in the BQ system using Be2Works software. The conversation also touches on the importance of calibrating the battery after modifications and the potential need for a reset to restore factory settings. Ultimately, the user successfully replaced the cells and configured the battery parameters, resulting in improved performance.
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FAQ

TL;DR: A rebuilt 4-cell Aspire 1640 battery regained 2.5 h runtime—“Cells age, not cycles” [Elektroda, Wiesław Rzepka, post #14269425]—after swapping 3400 mAh NCR18650B cells and reflashing bq80201 firmware [Elektroda, TOMSON, post #14329818] Inline reprogramming tools cost ~835 PLN [Elektroda, TOMSON, post #14264882]

Why it matters: Knowing when to replace cells vs. reset firmware saves money and prevents pack lock-up.

Quick Facts

• Controller chips: TI bq80201DBT + bq29312PW protector [Elektroda, TOMSON, post #14257688] • Cell layout: 4 S 2 P, nominal 14.8 V, typical 4400 mAh (Acer Aspire 1640 Battery Spec). • Panasonic NCR18650B capacity = 3400 mAh; max continuous = 6.8 A [Panasonic, 2013]. • Be2Works v4.15+ supports bq80201; single-seat license ≈835 PLN [Elektroda, TOMSON, post #14264882] • Post-rebuild runtime measured: 2.5 h on balanced cells [Elektroda, TOMSON, post #14329818]

Is it worth replacing the Acer Aspire 1640 cells instead of just resetting the electronics?

Yes. The controller stopped discharge because the old cells showed high internal resistance despite 3.9 V open-circuit [Elektroda, Wiesław Rzepka, post #14258012] After fitting fresh NCR18650B cells, runtime jumped to 2.5 h [Elektroda, TOMSON, post #14329818] A reset alone could not overcome cell wear.

How do I load-test the original cells?

Use a 12 V, 5–10 W bulb. Draw 0.7–0.8 A until 3 V per cell, then log voltage sag [Elektroda, TOMSON, post #14258754] A drop below 3.1 V within 1 Ah indicates excessive resistance.

How do I wake a ‘sleeping’ battery after cell swap?

  1. Verify pack voltage crosses the fuse (14–16 V typical).
  2. Bridge SYS-PRES pad momentarily to ground.
  3. Connect charger to clear the protector FETs. If voltage stays zero, replace the 12AH4 fuse [Elektroda, TOMSON, post #14272385]

What fuse value should I measure?

A healthy 12AH4 fuse shows ≈0 Ω vertically and ≈13.9 Ω horizontally due to internal shunt geometry [Elektroda, TOMSON, post #14272385]

Do cycle counts always tell the true cell health?

No. The pack showed only 196 cycles yet cells were unusable; calendar aging raised resistance beyond controller limits [Elektroda, krzychu1985^, post #14269425]

What is a safe charge current for aged 18650 cells?

Limit to 0.5 A when voltage climbs quickly above 4.05 V; rapid rise signals high impedance [Elektroda, TOMSON, post #14269186] Panasonic rates new NCR18650B at 0.5 C (1.7 A) max continuous charge [Panasonic, 2013].

How much internal resistance is too high?

If pack voltage drops >0.6 V under 0.8 A load, cell resistance exceeds 75 mΩ each—double the new-cell spec of 30–40 mΩ [Panasonic, 2013].

Edge case: What if capacity won’t increase after reset and calibration?

The gas-gauge may remain ‘sealed’; without manual flash edits, repeated calibrations won’t raise reported capacity [Elektroda, Wiesław Rzepka, post #14269929]

3-Step How-To: Load-test and log your cells

  1. Connect a 10 W, 12 V bulb across pack.
  2. Record per-cell and pack voltage every minute until any cell hits 3.0 V.
  3. Remove load; wait 5 min and note rebound voltage. Large sag plus small rebound indicates worn cells.
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