After using Irssi since getting the tip in this thread I have come to the conclusion that irssi must be quite a power hog. Having 3g on, WLAN off, bluetooth off, gps off and no widgets on the desktop but irssi on all the time my battery drains in 7-8 hours. After charging my phone I'm going to run one battery cycle without irssi on to see if it still drains the battery as fast.

As a potential sollution I'm already looking at getting a dd-wrt compatible wlan router instead of the one I have now so that I can install irssi on it and ssh to the router with my phone. My friends running irssi on his server and is sshing to it with his n900, he had it on last night (10 hours) and it drained only 15% of his battery.

Anyone else with simmilar experience?