Battery Poor After AT&T Update

My battery life was great until the AT&T update last week.

Before, had 40%+ when I got home from work. 30%+ when I plugged in each night.

Now, had 7% when I got home last night, did not use the phone, and the battery was dead when I plugged in.

No change in habits.

Any ideas? Am I in need of a factory reset?

Thanks in advance.

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Battery Poor After AT&T Update