Well so my battery power never lasted more than 1 day (even if I didn't use the device) and after a lot of removing widgets and disabling stuff I found out the issue. The chat accounts; I had 4 accounts enabled: Google Talk, Skype, Facebook and OVI

I removed Skype and OVI and already saw big improvements. Any of you guys know of maybe some tweaks I can do to have the battery last longer? I use Google talk and Facebook chat so I do not wish to disable them.

Also is there some widget to enable / disable them?

you can try downloading cpufrequi (i don't remember the name) and you can underclock it when you don't using the phone and....they have even power saveing mode!!!!!!

If you're using 3g for the chat accounts, try switch to 2g. Depending on the operator, 3g can use 10 times more power for chat/im.

I always use 2G since 3G would drain much more the power.

I believe the battery issue is more related to the protocol through which they connect, some require a lot more frequent "pings" to the server to server know that you are still "online". The only one I leave on anymore is google talk and it has very little impact on the battery life, I have been contemplating turning on FB chat too as not many of my friends use google talk and I refuse to use AIM because it sucks battery life like a vampire sucks blood (by the quart).

I use a jabber gateway to aggregate my IM accounts. I have google talk, AIM, MSN & ICQ all signed on but the N900 just has to maintain a single connection.

I use http://jabber.rootbash.com/ but there are others.
You have to use a 'real' (desktop) Jabber client to associate your various IM accounts with the single Jabber account, but after doing that once it seems to work really well.

I have to sign on separately for Skype (no Jabber gateway exists AFAIK) and I don't think Facebook Chat is supported. But this has made a big difference to my battery drain.