new software download - now poor battery performance

What I would suggest (even if you go ahead and delete BBMessenger) is to read over this:
Here are some good charging tips, please read and you'll see that many of them will apply to you.
http://www.blackberryfaq.com/index.php/Maximum_Battery_Life
And here: http://supportforums.blackberry.com/t5/BlackBerry-Community-Post/Power-Saving-Tips-for-your-BlackBer...

Leaving the Browser on an active webpage will run the battery down.

Also, if you JUST recently upgrade, honestly, give it 48 hours and 2-3 powered-on battery pull reboots for the on-board device battery gauge to settle in. After an OS upgrade or reload, it will fluctuate.

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