Since the iPod touch doesn't display a battery percentage, how would I know when the charging is completed? In iOS 6 and earlier there would be a plugged-in icon meaning that the device is charged, but in iOS 7 there is only one icon that can mean both charging or charged.
iPod touch (5th generation), iOS 7.0.4
Battery icons
The battery indicator icon in the upper-right corner of the screen shows battery charging status and about how much charge is left in the battery. When connected to a power source, a small lightning icon will appear next to the battery icon:
If the battery charge is very low, the device may display a black screen with an empty battery icon, indicating that the battery needs to charge for up to ten minutes before you can use the device. If the battery is extremely low on power, the device may display a black screen for up to two minutes before one of the low-battery images appears; continue to charge the unit for at least 30 minutes or until it is fully charged.
Yes I already saw this article before and this doesn't help ansewering my question. For iOS 6 and earlier, there would be a lightning icon in the battery when it's charging. If it's charged then there would be a plugged-in icon in the battery. However, the lightnight icon besides the battery in iOS 7 stays the same all the time as long as it's plugged into the charger. So I have no idea when does it finishes its charging, as it doesn't even show battery percentage like iPhone does.
The indicator icon is only so useful if you're just trying to determine if the iPod touch's battery has fully charged. I think it was more convenient when the plug icon showed up, but what can you do? Send feedback, definitely.
However, there is a way to make sure you've charged fully--at least, this works for my iPod touch running iOS 7. When it's plugged in and charging if I wake the screen up it will either say "Battery Charging" under the time or "100% Charged." Obviously, when it says the latter it's fully charged. I don't think it matters that much if you fully charge the batteries in iPods today, so that's possibly why Apple removed the percentage display for the touch. They do say it takes around 4 hours to charge fully from being depleted, but basically you can just charge it as necessary and it will still maintain its capacity over time so you don't have to worry about whether or not it got a "full" charge or not.
How would I know when does the iPod touch completes charging?
