3rd pin in a small li-ion battery?

• 3rd pin in a small li-ion battery?
  Posted by ledtester on 10 Mar, 2018 22:17
• I have a small capacity li-ion battery - 3.7V, 770 mAh - which has 3 terminals. The red and black wires seem to be the + and - terminals. I wonder what the yellow wire is used for.
  
  These appear to be the datasheets for the battery:
  
  - https://www.beck-elektronik.de/fileadmin/templates/beck_folder/batterie-akku/akkupacks/BST-38.pdf
  - http://www.whaleyfoodservice.com/EquipmentManualsIntegration/Manuals/SAY0069.pdf
  
  The 1st datasheet describes the middle pin as "PIN2: TH (LNSR16H333JP-33K?/±5%)"
  
• #1 Reply
  Posted by glarsson on 10 Mar, 2018 23:43
• Thermistor, 33 kohm at room temperature, used for temperature sensing of the battery (over temperature protection).