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

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

unknown connector
According to 7 reports in our database (5 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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