battery jumps up after on/off

update:
so it seem like the weak signal is the culprit.

by the time i got home, battery was showing 60%. this was me using the phone from 6:00am-7:30pm @ work (more than usual because work was slow). once home, i turned cellular data off and went about my business. from 7:30-10:00pm, the phone went from 60%-59%!!! It only lost 1% of battery power. the only use in the 2.5 hour was couple of short calls(less than 2 min) and a handful of text messages. i left home after 10pm but i think it's pretty safe to assume, MY current lumia 920 is draining the battery when signal strength is weak. I'm going to try and get a micro cell from att to see if that'll make the difference.
 

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