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[Solved] Dell Latitude e6520 Battery: Replacing Cells, 60Wh Li-Ion 11.1V T54FJ, Panasonic 3100mAh Upgrade

dziubas34 17298 7
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  • #1 16282281
    dziubas34
    Level 9  
    Hello,
    I have a problem with the battery electronics for dell latitude e6520. Battery 60Wh Standard Li-Ion 11.1V Type T54FJ (original). Everything was fine so far but the battery is about 5 years old and kept short so I decided to replace the cells with new ones. Currently, I have a battery wreck with new cells because most likely electronics are blocking it. The laptop detects the battery but shows a 0% charge and does not charge or work on the battery and the indicator light on the laptop blinks orange quickly. In the HWmonitor or Battery Mon program, it shows the low capacity before the cell replacement (i.e. electronics remembers the capacity of these used cells). I don't know if I change back to old links, will it work (because it should work better shortly than it does now) but maybe there is a way to reset the electronics? Maybe someone has knowledge on the subject and directs me what to do about it? These cells are panasonic 3100mAh (originally sat here 2800mAh samsung).
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  • #2 16282311
    any56
    Level 39  
    You must delete the memory contents and enter data about the capacity of new cells.
    I did it through an external company.
    Unfortunately, I don't remember where ...
    The cost is about 69 PLN.
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  • Helpful post
    #3 16284864
    krzychu1985^

    Level 28  
    69 PLN for driver reset? A bit You will not reset the controller yourself. In these batteries sits the controller bq30420, bq30421, bq30422, bq30423 or bq8050 / bq8055. You need a password for these first 4 drivers, and special software and interface for all of them.
  • #4 16284922
    elektryku5
    Level 39  
    I will tackle the topic, whether disconnecting the links during exchange for this type of controller causes its blocking? Because the situation described here more or less looks like this ...
  • Helpful post
    #5 16285176
    krzychu1985^

    Level 28  
    The controller is stuck randomly, in some batteries it is stuck, in others it is not. I did not read the further part of my friend Dziubas's statement34- if after relocation of the new links, it does not help to put the old links back.
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  • #6 16287787
    dziubas34
    Level 9  
    I managed to partially control the situation, i.e. the battery lives and the laptop can work on it. It is very important in what order to cut off old cells and solder new ones, and exactly to connect the control board. First, connect the ground or "-" then in my case VL VM VH and at the very end of the "+" power supply. I desoldered the board and put it again in the correct order from the lowest to the highest potential and the laptop is working on battery and charging. The remaining issue of charging in the final phase. On an old battery, the max voltage after reaching 100% was 12,539V while now the charging ends as if it is 99% and the voltage increases. I thought that after some time it would reach 100% but I was afraid of 12,880V! It's almost 4.3V per cell so I didn't wait further and disconnected the charger. I will add that now when the battery is fully discharged and cuts off the power supply, the cells themselves still hold just over 3.8V. What should be the minimum voltage on cells when the capacity is close to 0%? I have an idea to discharge the battery to zero (according to the laptop) and then remove it and an external load, e.g. a light bulb, discharge it really to some voltage, I don't know what? 3.3V? 3V? The cells are Panasonic NCR18650A Li-Ion MH12210. I will add screenshots before and after battery regeneration. Dell Latitude e6520 Battery: Replacing Cells, 60Wh Li-Ion 11.1V T54FJ, Panasonic 3100mAh Upgrade Dell Latitude e6520 Battery: Replacing Cells, 60Wh Li-Ion 11.1V T54FJ, Panasonic 3100mAh Upgrade
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  • Helpful post
    #7 16288325
    krzychu1985^

    Level 28  
    The order of disconnecting and connecting electronics has already been described many times, it is also described in suspended topics, you have not discovered anything new :) These batteries have a charging voltage from 12.9 to 13.05 V, which for the section gives 4.3 to 4.35 V. In these batteries there are lg or samsung cells and in the case of bq8050 and bq8055 sanyo cells. These cells have higher charging voltages than the ones you used, these panasonic ncr18650a have 4.2 V. Light cells overcharging should not hurt, but believe me that without resetting new cells will not work well in this battery, further use may cause the battery to block. In these controllers, in addition to resetting the charging cycles and setting a new capacity, there is also a lot of things to be changed to adapt such batteries to work with cells with 4.2V charging voltage.
  • #8 17366184
    dziubas34
    Level 9  
    Problem solved. He helped me in 1985 ^. By the way, I recommend his website: http://naprawa-baterii.pl/ He knows his stuff, he does well and at a good price. I would recommend!

Topic summary

The discussion revolves around issues faced when replacing cells in a Dell Latitude E6520 battery (60Wh Li-Ion 11.1V, Type T54FJ). The user encountered problems with the battery electronics after replacing the original Samsung 2800mAh cells with Panasonic 3100mAh cells, resulting in the laptop detecting the battery but showing a 0% charge and not charging. Responses highlight the necessity of resetting the battery controller, which may involve using specialized software and hardware due to the presence of controllers like bq30420, bq30421, bq30422, bq30423, and bq8050/bq8055. The order of connecting and disconnecting cells is crucial for proper functionality. A successful resolution was achieved by carefully reconnecting the battery components in the correct order, although concerns about overcharging with the new cells were raised. A recommended service for battery repair was also shared.
Summary generated by the language model.
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