Battery pins.

Discussion in 'General Electronics Chat' started by Voltboy, Oct 18, 2007.

  1. Voltboy

    Thread Starter Active Member

    Jan 10, 2007
    197
    0
    Hello.
    Im using a battery from a Nokia cellphone (battery #BL-6C) in a project. The battery have 3 pins, the positive (+) and negative (-) are marked, but what could be the 3rd pin (actually its in the center).
    Btw the battery is Li-ion, 3.7V
     
  2. SgtWookie

    Expert

    Jul 17, 2007
    22,182
    1,728
    It might be a connection for an integrated temperature sensor, like a thermistor.

    Try measuring voltage to the + and - terminals using a DMM. If there isn't any, try measuring the resistance when it's at room temp; then charge it using the factory charger & phone for a couple hours and try measuring it again. Is it different?
     
  3. kender

    Senior Member

    Jan 17, 2007
    263
    0
    The 3rd pin could be either of two:

    - Thermistor (as have been already mentioned)
    - 1-wire interface for a fuel gauge IC inside the battery.
     
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