How to Test if Battery is Actually Rated Capacity?

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  • Bowline
    Dell E6400 PT434 type Battery Charging Stuck at 1%. Battery Pinouts?
    by Bowline
    My question pertains to understanding the control circuity inside a Dell PT434 type battery used in Dell E6400, E6410 and other Dell notebooks?

    Does anyone have a circuit diagram for the inside of a Dell PT434 battery and/or a description of how the control lines work to control this battery?

    My reason for asking is I have a battery which I cannot get to charge beyond 1% in a Dell E6410 or E6400.
    The LED bar graph charge indicator on the battery shows one LED lighted when the info button is pressed.
    I have tried multiple different Dell power adapters. My Dell...
    06-11-2025, 10:13 AM
  • sam_sam_sam
    EBC-X 8-Channels 18650 Battery Capacity Tester Charge & Discharge 10A Aging Test Modificatio
    by sam_sam_sam
    This is another battery testing machine that needs to be modified for the cooling fans because these are noisy but not as bad as one of the other battery testing machines that I had modified recently because of it being too noisy

    The battery testing machine is going to get two temperatures controlled cooling fans like one I put in the other battery testing machine I just have to remove the temperature sensor and relocate the temperature sensor to one of the heat sinks and put one on the other heat sink so the fan speed can be controlled by temperature

    https://www.eb...
    05-05-2024, 06:07 PM
  • mkdj
    ASUS X571 no power : battery issue?
    by mkdj
    Hello everyone,

    Mark and model: ASUS X571
    Symptoms: not turning on. There is only the LED battery indicator working. The owner of the laptop told me this problem arrived one week after having changed the battery. He then managed to power on the laptop only once, and then it never powered on again.

    Tests already made:
    - Battery is charging when laptop is plugged in. The LED battery indicator turns white after a couple of hours of charge, indicating that battery is fully charged. However, laptop won't turn on anyway, with or without AC plug.
    - I have removed...
    07-14-2025, 09:16 AM
  • techfreak9356
    Vostro 3400 (LA-K033P) won't charge battery, everything else ok
    by techfreak9356
    I bought a Vostro 3400 motherboard (LA-K033P) to upgrade over my damaged Inspiron 5593 (LA-J091P) board. Everything else is ok except for the battery. This battery I am using now is already a replacement one since I disposed of the bloated original one. Back in the Inspiron 5593 motherboard, the battery charges fine and is identified just fine. However, with the upgraded motherboard, suddenly the replacement battery is labeled as "Not a dell battery". When I borrow a similar battery from my colleague (which did not have replacements yet), it is identified and charges just fine.
    ...
    09-14-2023, 11:10 PM
  • Document Archive
    ISL88739AHRZ ISL88739 Laptop Battery Charger Datasheet
    by Document Archive
    The ISL88739 & ISL88739AHRZ are a highly versatile combo battery charger
    configurable for operating as either a Hybrid Power Boost (HPB)
    charger or a Narrow VDC (NVDC) charger, supporting 2-, 3-, or
    4-cell batteries. Both configurations allow the battery to work with
    the adapter together to supply the system load when it exceeds
    the adapter capability, referred to as system Turbo mode. HPB
    charger configuration reverse-boosts battery energy to the system
    bus to help the adapter provide the system power in Turbo mode.
    NVDC charger configuration...
    11-05-2024, 03:28 PM
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