I agree 3G is probably the biggest factor. With my 900 I always kept wireless off which made a significant difference. With my 950 I keep the Wi-fi on at home (standby on) and 3G off. The settings menu allows you to have either / or. The Wi-fi only does drain faster than all off but still lasts a long time. I keep the Wi-fi on because I use Wikipedia frequently, and I have a newspaper subscription. If you don't use it, then I would keep both Wi-fi and 3G off at home.
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