Did I get the right battery
Referring to the attached picture, the positive and negative terminals on ifixit's battery (installed) are different from the original battery. Did I get the correct battery?
Best I can find out is the battery model numbers 616 0550, 616 0551, 616 0552 & 616 0553 are all compatible with an iPod Touch 4th Gen A1367.
Looking at your image zoomed in I can't see any polarity markings on the battery connector for the battery that is installed now, is that the problem you're referring to?
(click on image)
If you have a DMM (digital multimeter) you can check the polarity of the battery if it has any charge in it at all.
Set the meter to Volts DC 20V and connect the meter's red lead to the +ve leg of the battery and the black lead to the -ve leg and you will read the voltage. If the polarities are reversed you will still read the voltage but there will be a -ve symbol in front of the reading e.g. -3.5V in lieu of 3.5V
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