IOS 6.0.2 severely drains the battery.

IPhone 5.  Made a 5min call during which the battery capacity decreased by 15%. Then shut down wifi, 3G and cellular data outdoors. Back home, immediately reopened the wifi, the battery capacity dramatically dropped from 14% to 10%. Then with no operations it dropped from 10% to 7% in 30min. Besides, battery cap drops when the iPhone is being used under a USB-computer connection condition.
ipad mini wifi+cellular.  Seemingly the battery cap stopped at 90% during an all-over night charging(less than 7 hours).
Conditions:
Beijing, China
dropped by 15% with the temperature -10 C outdoor
the others happened in the room temperature around 20 C
WIll APPLE FIX THIS FATAL PROBLEM SOON?

"I usually recharge the battery until reach 80 to 90%. If you always full recharge the battery, the battery will drain quite fast.
Make a full recharge just once a month (says IOS 6 User's Guide)."
Please inform me where abouts it say to only charge your battery to 80/90% on the iOS 6 guide, because I have gone through the whole thing PDF and nowhere in there does it say to charge only to 80-90% and once a month only to 100%
P.S. you only have so many charge cycles, around 400,  a full charge is 0-100% you can also do a "full charge cycle" if you do one day from 50% to 100% that is half a charge, and the next day 50-100% is another half, which is one full charge, it all depends on the user really.

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