settings / internet connections / connections
select your wifi connection
edit / next / next / next / advanced / other

set power to 10mw and power saving to on (max)

yes! thanks. the rabbit hole goes really deep.
threr should be a per connection and a default config.

This has no big sense - Nokia people explained in some bug report that this value is a MAXIMUM power value. That means WiFi chip usualy runs on low power. But sometime it is needed more and if you restrict WiFi by 10mW then you have a less stable wiFi connection.

The reason for this option is regulatory - in some countries it is required to have not more than 10mW.

It was my 'power saving' setting that changed itself when I had the problem. Turning that off definitely sends the power drain off a cliff.

In the early days, there were anecdotal reports that the 10mw 'Power' setting was more battery-friendly.
I've had mine on 10mw since I got it in October, so I can't really comment on drain there, except to say I've had no problems connecting.

WS

less stable means that you might get more corrupted packets and actually you end up draining your battery because your connection takes couple of seconds longer to transfer data. Bit same as when you need cpu power it should be delivered immediately but at idle it should throttle down.

But still. If it helps then leave it as it is

OK, I'll try life at 100mw for a while and see if I'm missing out...

WS

Hmm, I'm bumping this topic.

I've been having a similar issue with random battery draining but it has nothing to do with the browser. I can see that my processor usage randomly goes up to 5-10% after I've used the phone for calling or listening to music, and drains the battery in a couple of hours. This happens very randomly. Like yesterday I surfed on the web and listened to music but the processor stayed at 0%. Before I went to bed I sent one SMS and after that the processor usage got up to 5% and stayed there until battery was dead. I'm still yet to caught the process that's doing this.

Would this be caused of the bug 9566, or is it something else?

ive installed wifi switcher and used it to kill the wifi when not using it

this seems to off helped alot

ive been using wifi alot latley instead of my 3g and it seems that when wifi has been used it seems to affect the battery quickly even if you disconnect

using wifi switcher for the time being seems to of helped my battery drain

can only confirm, when using wifi switcher does really save alot of battery. the device doesnt look after wifi spots to connect to.

I have actually another weird phenomena with battery drainage. when i turn my device off it atually discharges quiet much during the night like 10-15 percent. i thought when the device is off its off? even if its required for some process that still continues when the phone is off, 10 percent is a lot. someone experience this too?

something similar happened to me with the program for listening pandora or something like that, do you have it installed?