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Hi I have an iPod mini 2nd Generation. The battery has been holding quite well, I haven’t seen any battery drain yet but I am a bit worried if it doesn’t hold up since it is still an original battery, especially worried on expanded battery

You can check the battery stats of your iPod, iPhone or iPad by installing Coconut Battery on yourMac and Hooking up to a USB port and running it. https://www.coconut-flavour.com/coconutb

It depends on how long have you had this for and how often did you charge and drained the battery. I think when the 2nd gen Mini came out Apple was bragging about the battery which was holding more than double the charge than the 1st gen. I think it is rated for 18 hours audio playback. Now, since these are quite old device, don’t expect the battery to last that long, but I would imagine it should still hold around 8-10 hours playback, again, depending on the intensity that you have been using your device.