Battery Life with .113

I finally broke down a month ago and upgraded to .113 based on the positive findings and it has been for the most part. I can go easily for two days with the usual apps loaded, GPS on, etc with the caveat that talk time is at a minimum. This is a work phone so I am on BES and I found that I can drop the battery meter in half if I talk for 20 min and that get worse the longer I talk. Yesterday afternoon I was at 66% driving home I talked for 21 mins got home and I was at 34%. Any advise to minimize this or causes would be appreciated. Thanks in advance