Checking the Battery Pack (TP 600/600E - 2645)

Checking the Battery Pack

Battery charging will not start until the Fuel-Gauge shows that less than 95% of the total power remains, with this condition the battery pack can charge to 100% of its capacity. This protects the battery pack from being overcharged or having a shortened life.

Do the following:
  1.  Power off the computer.
  2.  Remove the battery pack and measure the voltage between terminals 1 (+) and 4 (-).
     See the following figure:

    NOTE: Signal lines not used in these steps are used for communication between the  system and the battery.

    Terminal Voltage (Vdc)
    1 0 to +12.6
    4 Ground (-)


  3.  If the voltage is less than +11.0 Vdc, the battery pack has been discharged. Recharge the battery pack.

    NOTE: In this case, the battery pack is over-discharged. It takes at least 3 hours to recharge the battery pack  even if the indicator does not turn on.

  4.  If the voltage is still less than +11.0 Vdc after recharging, replace the battery.

  5.  If the voltage is more than +11.0 Vdc, measure the resistance between battery terminals 3 and 4.  The resistance must be 4 to 30 K ohm.
  6.  If the resistance is not correct, replace the battery pack.
     If the resistance is correct, replace the system board.

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