I love my i touch 4th gen and ive had it for four years and noe it wont charge past 15 %

Question

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Answer 1

Try:
- Reset the iOS device. Nothing will be lost
Reset iOS device: Hold down the On/Off button and the Home button at the same time for at
least ten seconds, until the Apple logo appears.
- Reset all settings      
Go to Settings > General > Reset and tap Reset All Settings.
All your preferences and settings are reset. Information (such as contacts and calendars) and media (such as songs and videos) aren’t affected.
- Restore from backup. See:                                 
iOS: How to back up                                                                
- Restore to factory settings/new iOS device.             
If still problem, make an appointment at the Genius Bar of an Apple store since it appears you have a hardware problem. I suspect a bad battery
Apple Retail Store - Genius Bar                       
Apple will exchange your iPod for a refurbished one with a new battery for $79. They do not fix yours.
Apple - iPod Repair price                       
A third-party place like the following maybe will replave yu battery for less. Google for more.
iPhone Repair, Service & Parts: iPod Touch, iPad, MacBook Pro Screens
Replace the battery yourself if you are up to it. Yo can purchase a new battery for about $10
iPod Touch Repair – iFixit