I've got a problem with battery temperature and many times my phone isn't charging (temperature below 5 Celsius degrees). Temperature is jumping randomly from -20 to +7 degree, most often not charging range. Then I dissmantle the phone unhook the battery and give some touch to the battery connector and temperature returns to correct value. The battery connector has 6 solder points connected in pairs (I measured resistance between them at is around 1 Ohm), so two for power plus, two for power minus and two in center for temperature I think. The device behave like have a "cold solder" in temperature joints only because it doesn't restart. So last time I dissasembly the phone I took a soldering iron and resolder one of center joints (to second center joint I have too big tip in soldering iron)
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and for two days the temperature was ideal, but today morning it drops down to 2 Celsius and a moment later rise to 7-10 degrees. After few hours it recovers to normal temperature again (this jump was for no reason, I'm not using phone at this time)
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Of course if it is wrong today it can broke every moment, so I want to repair it to end. Is my idea that it is a cold solder is correct? What else I can do to repair the battery temperature, maybe I should resolder other joints?
