Introduction
This Menu allows diagnosing/Checking the Battery voltage much easier
This can be done with an iPod Nano 1st Generation To 6th Generation.
- 
                  
                  - 
            Force Reboot the iPod by holding down the Select and Menu buttons together. 
- 
            When the display shuts off, Press and hold the Back button while still holding down the Select button. 
 
- 
            
                            
                            Conclusion
                          
                          It should be in the test menu now.
3 comments
Big BIG thanks to @oldturkey03!!!
Can it be on nano 4
My Bad, It can be done on any iPod nano (1 to 6)
I'll be changing it to iPod nanos in general.
Thanks for Bringing this up!
Short answer: Yes, It can.