Very Low Battery. Please Wait

Okay so i just found my old iPod that hasn’t been used for years. The first time I charged, it was charging well but it took for the ipod for like 3-4 hours to power on itself. Everything was fine, the display was working fine, the ipod was charging, except for the click wheel, the click wheel wasn’t responding to anything. The menu, the select, everything! The hold switch was off, i tried turning the switch on and off but nothing. I tried to unplugged it but a minute later it died.

The second time i charged it, the click wheel was responding since i managed to turn it on by the click wheel, but after turning it on the boot was different there is a black background on the apple logo on a monochrome like screen and after that it displays “Please Wait. Very low battery” before the iPod turns off shortly.

The first time i charged the iPod there was no boot screen and it was on the track that i left on many years ago. It just suddenly turned on

The Cable I'm using right now is the 4s’s 30 pin charger and the power brick that came with it. Also the first time i charged it, i charged it on the usb port on the extension that looks like this.

So what is the problem here, the iPod or the charger?