I have an unusual rapid battery drain under 50%

With all the talk of battery related issues I thought it would be easy to find one to fit my current problem. I could not find one so hopefully, this is not too much of repeat thread.
My one-year old iP5 has been updated to 7.0.3. It runs very well and is in excellent condition, never having been damaged from falls, water dunks or...anything else. The last few days when the battery meter gets below 50% I can literally watch the numbers drop. It went from 49% straight to 39%, immediately then dropping in 5% increments down to around 10%, when it dropped by 1% increments. And then it simply held at 1% for quite some time. I decided to try to "reboot" the phone but it would not restart because apparently they won't start up with just 1% power. I had not been using the phone heavily throughout the day and I am used to having 30-40% power at this time of day so...I really didn't believe the meter. I plugged the phone in and immediately it turned on and had 15% on the battery meter. I unplugged it and replugged it in and it showed 20% power. This didn't seem too unreasonable so I unplugged it and went about the rest of my evening. An hour or so after that it had dropped to 19%, which seemed ridiculous considering I had been using it quite a bit. Over 2 hours later when I was wrapping up my day it still had 19% power. So...I plugged it in and it had the usual 100% when I woke up this morning. This routine has actually occurred twice since updating to 7.0.3. I have not added any apps and nothing odd about my routine. My IT guy (it is a work phone) says he does not believe a clean install of the OS would solve this problem.
Any suggestions?
Thanks in advance,
Steve

Yes, you should be able to do so if that is enabled by Vodafone.
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Message was edited by: Ansuz82

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curve8530curve8330 wrote:
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Read more of what was advertised. The fineprint note below says:
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I have an unusual rapid battery drain under 50%

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