Erratic battery performance since latest firmware update

[speakercreep]

Has anyone else notice poor/erratic battery performance since upgrading to 3.56.651.0? Ever since the upgrade, my battery life has been poor at best. My battery would last all day prior to the update. Now I end up having to charge it mid day. My usage hasn't increased any. As far as the erratic behavior. Sometimes battery life will drop from 70% to 20% in the matter of seconds when all I did was responded to a text message. If there is an existing thread relating to this, I apologize.