IPhone 5S Battery drains quickly, even the phone in standby

Question

I got iPhone 5S at the end of November. I was a happy customer until 35 days.
My phone battery started draining with no reason. It just drains, even if you keep the phone in stand by mode. I am scared to answer phones, browse internet or access apps, since it drains the battery. I went to downtown with no car charger with 65% left on my batter at 5:00 PM. I just kept my phone in car and used the Viber to send 5 text messages, one phone call. By 8:30 PM we return back home, the battery is 0%.
I took appointment with "GENIOUS BAR". When I went there, a lady attended me, and she diagnosed my phone and said, my batter is perfectly good .. and yeah.. GOOD NEWS.. She also, says .. she dont have replace my batter since her diagnose told her that the batter is good.. YA.. YA.. all happies..
Now, I asked, then why my batter is just draining, she said, it is because I have some crashed apps like Facebook, safari, youtube, viber, casino app etc. She said, restarting the phone also doesn't work since the crashed apps just drains the battery. I said, wow.. that is great, you found the issue.. Now, what is the solution, since we know the problem.
She said, she has to erase the iPhone and format as a new phone. She asked me if I backed up the data. I know, this will happpen, so I said, I already backed up the data. Now, she erase the iPhone and reboots the phone.. and says.. YOUR PROBLEM FIXED.. Go home and sleep happily.
I was very happy.. my batter was at 20% when I was in the store 6:00 PM. The drive from apple store to my home is 15 minutes. I drove back and by the time I reach home, my batter is 5%. Ohh.. I forgot, I used my phone once while coming back home telling my wife that my battery issue is fixed.
Now, is my battery issue fixed?? NO
Does apple GENIOUS know about the problem?? NO
I still have this issue.. carrying apple chargers.. everywhere I go..
Way to GO APPLE.. best customer service support.. I ever got. .

Answer 1

I had this EXACT same experience. Went to the Apple Store and they told me to do the same thing. So I did a full restore on Friday night. No new apps, no email account set up, push turned off, no texts, no phone calls, connected to wifi. This is how my battery life worked out doing nothing but sitting unplugged on standby at home.
Jan 10, 11:06 PM - 100% battery
Jan 11, 3:12 AM - 81%
Jan 11, 3:46 AM - 77%
Jan 11, 4:16 AM - 73%
Jan 11, 5:19 AM - 65%
At 5:40 AM, because I thought I had thoroughly proved my case (taking screen shots of my battery status), I did a full restore of my most recent backup. Took it into the Apple Store today, and they said the same thing. Battery looks fine, it's not a hardware problem. Because I did a full backup restore, they can't see anything wrong with my phone. The screenshots I took of my battery levels after doing a full restore? Irrelevant. Doesn't prove anything. They use a diagnostic app that looks at the battery usage history of my phone, and since I restored the old backup at 5:40 AM, they don't have any data corresponding to my screenshots. They recommended I do a full restore again and operate for a few weeks to see how it goes. What about my old text messages that I refer to, my contacts, my notes, my call history? Too bad.
At this point, I feel less like a customer and more like a lawyer who has to prove my case in a hearing at the Court of Apple. I have to gather the evidence, then make my case. But why does the burden of proof fall to me, the customer? I recognize that they want to prevent fraud or stupid user error, but this is ridiculous.
The whole "use it for two weeks then come back" make me think they're really saying "use it for two weeks and hopefully Apple will have released an iOS update by then that fixes the problem--either that or you'll give up and stop bothering us". You know what? It's working. I'm just about ready to drop the issue, wait for iOS 7.1 to be released in March 2014, and hope that there have been enough complaints like this for them to address the problem, if it is truly a software problem.