Replacing 3.7v battery questions...

Discussion in 'The Projects Forum' started by UnnamedUser159, May 19, 2016.

  1. UnnamedUser159

    Thread Starter Member

    May 3, 2016
    130
    0
    Hi there.
    The device uses
    E505068 120503
    E120402-bu50-21
    1800mah 3.7V 6.66Wh
    battery.
    It has 3 connections(wires) to the board of the device(Cutepad Q5) - black, yellow and red.
    I see the same battery in my country but it has only 2 wires.
    Maybe third is some heat protection. I am scaren on my own to make the changes and am asking for advice :)
    The woman is taxi driver and uses it for "taking addresses"

    Thanks in advance!
     
  2. wayneh

    Expert

    Sep 9, 2010
    12,137
    3,054
    It might be heat sensing or a way to isolate two cells for separate charge control. A quick search didn't turn up anything.
     
  3. UnnamedUser159

    Thread Starter Member

    May 3, 2016
    130
    0
    Do i think right ?
    Maybe the original battery is better than the possible new which i can take with 2 links, but the new is also a option?
    I can purchase the new one and try to full charge it and see if it gonna goes hot or not? If not i can make full discharge though some application with video and if everything is fine totally everything is ok?

    Nice day;

    edit
    >>>
    What if i take only controller from old battery and connect it to new cells?
     
    Last edited: May 20, 2016
  4. KeepItSimpleStupid

    Well-Known Member

    Mar 4, 2014
    1,146
    204
    Not really sure what your question is?

    The third wire COULD be:
    1) Thermister which is common in a Li-Ion battery. Although there are usually 4 terminals.
    2) Some sort of battery ID from an IC to even a simple resistor.
     
  5. JMac3108

    Active Member

    Aug 16, 2010
    349
    66
    The third wire in a Li-Ion battery is normally from a thermistor that is mounted inside the battery to monitor the temperature on the Li-Ion cells. The charger uses this to disable charging if the cells get too hot.
     
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