Charge your AirPods and learn about battery life - Apple Support
Replaced my Dad's old iPod mini battery (wouldn't keep a charge) to give it a second life, cost me $10. I have an iPhone already but like the retro '00s look :
Check the status light and battery charge on your iPod shuffle - Apple Support
Amazon.com: New Replacement Battery A1641 A1574 Compatible with Apple iPod Touch 6 6th Gen 1043mAh 3.83V + Tools : Electronics
How to Check AirPods Pro Battery Status on your iPhone or iPad - YouTube