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Yep, it can suck down a battery pretty quick if it is in some sort of "smart switching mode" or always scanning to connect to the strongest network.
Also, if you have a bunch of "Wi-Fi only" stuff enabled (more frequent email checks, data syncs, app updates, etc.), that will obviously drain it down faster too.
Not sure how old your phone is but most of them now have a sleep/hibernate option, which disables Wi-Fi and cell standby (typically the biggest battery hog) for specified periods.
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