Author Topic: 3rd pin in a small li-ion battery?  (Read 345 times)

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Offline ledtester

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3rd pin in a small li-ion battery?
« on: March 10, 2018, 10:17:39 pm »
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%)"
« Last Edit: May 02, 2018, 03:44:43 pm by ledtester »
 

Offline glarsson

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Re: 3rd pin in a small li-ion battery?
« Reply #1 on: March 10, 2018, 11:43:15 pm »
Thermistor, 33 kohm at room temperature, used for temperature sensing of the battery (over temperature protection).
 
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