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Originally Posted by mxl180
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Well, it "works" in that it will disconnect your data after the allotted time. The problem is that I think it will ONLY disconnect after that allotted time. So, if the data connection is active and you get a phone call, you will not be able to pick up the phone. You'd have to manually disconnect data via comm manager, but usually that means you'll miss the call. If the data session is not currently active, you'd be able to pick up the call with no problem. CDMA is annoying in that you can't have both data and phone simultaneously.
As it's been previously noted, as long as the arrows are greyed out you're not actually using data, and therefore no real battery drainage more than disconnected. If you're noticing that your battery is draining more quickly with the data connection being active too much, you'd be better off managing any programs (email, weather, rss feeds, etc) that check data automatically, and maybe extend the time in-between checkups, or like weather for example, have it only go online manually (i.e. when you do it yourself instead of a set schedule every hour).
That, along with things like Lumos (hightly reccomended!) and nuedynamicclock (don't use with windows mobile 6.5.1, though), went farther towards saving battery life for me more than the automatic disconnect tweak.