Chosen Solution

My iPod Nano 5th generation was not turning on so I took it to a 3rd party vendor to get it fixed. They replaced the battery for a new one. Now, when I charge it for a long time (over 24 hours), it stays on when it’s unplugged but it’s only showing a charge of between 25-50% so it’s not staying fully charged. What’s the deal? Is it unfixable?

@mayer the OP can use 3uTools (www.3u.com). However, in my experience iPods do not display battery information. Haven’t tried a nano per se so it could be different. For the OP: As for the “I don’t understand why this place wouldn’t just replace the logic board and try it?”… most shops will not have spare nano boards laying around. iPhones yes but not iPods. There are no schematics available for the nano and trying to do board level work is nothing more than guess work without them. Besides, just how much money are you willing to spend on this device?

Take it back to the 3rd party repair shop. Could be they installed a faulty battery