How can I check an iPod Touch's battery health?
I want to sell an iPod touch (4th generation) - iOS 6.1.6.
Potential customers have been asking and I would like to be able to tell them about the battery's health.
How can I check this device's battery health?
Is there an effective yet simple way to do it?
I tried to download an app but it requires iOS 7.0 or later.
If I try to update the device I see the message:
Your software is up to date.