HELP serious battery drainage!!

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http://androidforums.com – when i woke up this morning my battery was at 100% as usual. i left my phone on standby for around 4 hours and turned it on to see the battery at 33%.... i was shocked i had not used my phone one bit. i checked the battery usage which said that the dialer took 47% of the battery.... what could this be, is it an app i installed thats using the dialer in the background? please HELP? (General)