shows 'fully charged' plug icon in corner but the green battery indicator is not full
I have an iPod touch 4th gen, it works great however I have been having charging issues
whenever I charge, sometimes the 'fully charged' plug icon will appear in the top right corner, however the big green battery indicator on the lock screen would only appear to be two-thirds full.
when I do unplug, the battery always appear to be at 80-85% rather than 100% full. Why is this?
Also, sometimes when I charge ipod using the plug (or everytime when i connect it to my laptop)- it will say 'charging is not supported with this accessory' on the screen
this is what it looks like when I charge using my plug and cable:
iPod touch (4th generation), iOS 6.1.6