weird battery drain/restoring after reboot issue
My battery drains mostly after accessing the cellular network, and I think that it does rapidly after using certain apps somehow in the background even while the data is not active.
-This seemed to be the case with a previous facebook app release, and it showed that the facebook app was running in the background before.
-right now, i can see that the home & lock screen, settings, and messages are the top 3 battery using apps though..
In the past, I had this issue with iOS 8.4.1, and I rolled back, and synced itunes, and signed out of itunes on my iphone 5, and that stopped the issue prior.
However, after updating several apps such as LINE, Snapchat, Facebook, Messenger, and Instagram, my battery is draining ultra-fast; possibly even when I am not using them. I find that it seems to happen simply after accessing the network by wireless or Cellular network. But I think that it might happen from accessing instagram quite possibly. It might be that or or snapchat. yet sometimes I don't use one of those I think.
But I am finding that my battery will show something like 60-80 percent, then after 20-30 minutes, it drains very low (or shows that it is drained. On Thursday, it went from 60ish percent to 17, then I turned it off, then on, then it showed that it needed charged. when I plugged it in later, and did a hard reset, it suddenly showed 67 percent.
Tonight, I don't know what it was on, yet I think that it was on 87 percent. Twenty minutes later, I accessed my cellular network, and all of the sudden it showed 1%. after accessing instagram and possibly Line. After shutting down and restarting a bit later, it showed i needed a charge, yet after a doing a hard reset, it showed power at somewhere between 42 and 47%, which I think means that it wasn't actually drained all the way. I think that there is something wrong and that it is related to one or more of the apps. Then it started draining quickly on the display. So I shut it down again. Later, after turning it on, it showed that it needed a charge, but the restart or hard reset did not do anything. But when I plugged it in and did a hard reset, it showed a higher percentage again.
I feel like this may not simply be a bad battery, just like in the past when people said to replace my battery when the iOS had a glitch. How can I test this regarding the apps or somehow do anything to resolve this issue without getting a new phone or battery?
iPhone 5, iOS 8.4