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6 pins connector
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.

Pinout status: +6 -2
According to 8 reports in our database (6 positive and 2 negative) the IBM ThinkPad Battery pinout should be correct.

Is this pinout
NO DIY devices
IBM ThinkPad Battery visual pinout:click to enlarge
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