The N95 initially comes with its WiFi power set to a whopping 100mW.
That is going to chew some serious battery power if you use WiFi mode extensively.

Why not give this a try and set your WiFi power to 10mW

Tools – Settings – Connection – Wireless Lan – Options – Change – Yes – Options – Advanced Settings – Yes
Then scroll down to Tx power level and select 10 mW

WiFi