Hi, I did like described, and first it worked fine, and I was happy!

I followed the instruction and charged the new batterie to 100% and left it on the charger for at least two more hours.

After, I used the iPod (Photo) until it switched itself off due to an empty battery. Then I put it on the cable to charge it to 100% like recommented, but it does not charge!?

It keeps turning on and off, the display alternates between the Apple logo and saying the iPod is empty and should be charged!? What have I done wrong?