I have been given 5 new iPhone 6 phones and none of them can hold a charge and the latest one cannot charge at all

Question

When I bought my iPhone 6, the phone was great, but now the phone has given me many problems. I’ve gone to the Apple Store 5 times already with the same problem and every time they just give me a new phone.  My first problem was that the phone stopped charging. I took it to the Pentagon City Apple Store in Arlington, VA and my phone was given a diagnostic.  After the diagnostic, my battery was said to be good and my phone was then replaced.  After my phone was replaced, the second phone would drain fast and go from 100% to 20% in about 2 to 3 hours of light to regular usage (web surfing, facebook, spotify, soundcloud) while connected to Wifi and the battery would charge very slowly. After about a week of this, I returned the phone, and told the “Apple Geniuses” at the store about the problem and was given a diagnostic and a new phone. 
Every time I go, I am told about closing apps out (which I always do), turning location services off until I need them (which I do), and turning the screen light brightness down (which I turn more than halfway down).  The problem of the battery draining fast and the slow charging persisted with the third phone and I eventually took the phone back to a new Apple Store in Towson, MD yesterday. A diagnostic was run on my phone and I was given a new phone and a new charger.  My phone worked perfectly like when I originally purchased it.  Then later last night it stopped charging just like my first phone did.  I took it back today, a diagnostic was run on my phone, and I was given a new phone.  Every time I went to a store, I was told by the “Apple Geniuses” that this was the first time that they heard about this problem, which I found hard to believe because I heard at least 30 different people come in with similar problems each time I was in the store.  When I left the store today my phone charged for the 1st 30 minutes.  However, I took the phone off the charger to make a call and now the phone will not charge again. 
After talking to a few people on message boards, I am convinced that the problem is a virus within the IOS software update around the 8.1 through the 8.3 release.  I want to know if there is a way to go back to the 8.0.1 software?  That way, I don’t keep having the same problems.  I have had every iphone since the iPhone 4, and have been pleased with the product thus far, except for my current problems.  However, if the problem cannot be taken care of expeditiously I will be forced to go to buy a Droid.  This is very time consuming having to spend 1 to 2.5 hours in the store and is costing me money because of gas, 20 to 25 minutes driving there and 20 to 25 minutes driving back home each time and having to pay to park when I go to the one in Arlington, Virginia.

Answer 1

adkennon wrote:
And maybe you don't talk to too many people but I've been on many forums on different websites where people have had similar problems and a lot of people in the store were having battery problems where they were draining too fast. What I learned is that all the people who did not download the updates are good. There phone is working the same. The people who have, they're having battery problems
I have downloaded every update and my battery life is better than any previous iPhone I have ever owned. I see posts from hundreds of people every day, and this is not a commonly reported problem. While there are a few random reports of battery problems, it is no more than I have seen for any other model or any other version of iOS in almost 8 years. Usually problems of rapid battery drain can be traced to bad apps (FaceBook is the worst offender) or corrupt data being synced from iCloud or other sources (gmail, Windows Live, Yahoo, etc).
The simple test is to restore the phone as New. Do not create any email accounts. Do not install any apps. Do not enable FaceTime or iMessage. Do not enable Twitter or any other social networking app. Use it for a day and check the battery usage. You will find that it is working well.
And also see this: http://www.overthought.org/blog/2014/the-ultimate-guide-to-solving-ios-battery-d rain. It is the best treatise I have seen on the subject of battery usage.