ATX, WTX and other standard and proprietary power supply (PSU) cables connectors  > IBM pinouts
battery Pin
Name
Pin
Number
Description
1 VCC  
2 KEY  
3 CLK  
4 DATA  
5 THERMAL  
6 GND  

This is the main and backup (UltraBay) battery pinout.

THERMAL is a 10Kohm NTC resistor with the other pin connected to GND.

The i2c/smbus CLK and DATA lines of the battery have no internal pull-up resistors, therefor relying on the host systems pull-ups.

6 pin unspecified connector layout
6 pin unspecified connector
According to 8 reports in our database (6 positive and 2 negative) this pinout should be correct.

Is this pinout
IBM ThinkPad Battery visual pinout:
IBM ThinkPad Battery diagram
click to enlarge
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