Should I disable wi-fi when not using it ? Will this preserve the Battery?

When I`m at home,should I disable the wi-fi when not using the internet ? Does this preserve the battery?

http://ipod.about.com/od/iphone3g/tp/iphone-battery-life.htm
#5 on the list to preserve battery:
Keep Wi-Fi Off
The other kind of high-speed network that the iPhone can connect to is Wi-Fi. Wi-Fi is even faster than 3G, though it’s only available where there’s a hotspot (not virtually everywhere like 3G). Keeping Wi-Fi turned on at all times in hopes that an open hotspot will appear is a sure way to drain your battery life. So, unless you’re using it right this second, keep Wi-Fi turned off.
Find it in Settings -> WiFi -> Slide to Off

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Should I disable wi-fi when not using it ? Will this preserve the Battery?

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