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Exchange issues have been the major cause of battery problems. I had it with a recent one. SOP for some (now me) is to remove your exchange account before or after you update, then add it back after running the update. That often will prevent or fix a problem, and cured my battery death issue the one time it happened to me. No issues with the last one though and I didn't remove beforehand. THere are a lot of variables involved with battery life - types of email accounts, how you have them configured, if you're streaming media, etc.
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