New battery not charging

Hi all!

Have an Ipod Nano 7th Gen that was immediately dying upon removing it from power so I opened it up and soldered in a new battery. Now it no longer turns off when disconnected from power but it also doesn’t charge to 100%. I left it in for several hours on multiple chargers and it always shows around 1/4 charge or less. Any ideas? Could the replacement battery be bad? Did I not solder in the 3rd lead properly (assuming that one might be for battery status).

Thanks in advance for any suggestions. These are still good MP3 players in 2021 but little to no help or support from Apple.