My N900 has never had the most stellar battery performance. With heavy use I normally had to recharge half way through the day. With light use I would need a recharge by about 7pm. I am normally logged on to skype, hotmail, ymail, googletalk and facebook chat so that could be why the battery dies so easily.

However, in the last week or so something has gone terribly wrong with my battery. It is doing four hours only. This is even with me having switched off all chats and switching to 2G mode. The battery just drains constantly and consistently to last no more than four hours.

So obviously there is a serious problem somewhere as the drain has nothing to do with how heavily I use it and even with heavy use four hours seems really really terrible. Either the battery has developed a fault or peharps there is a heavy process going on in the background that is eating the battery. I haven't noticed any slow down though.

The only recent things I have installed are Desktop command execution widget, midnight commander, proximityd, tweakr, htop.

Htop shows as top process:
messageb (User) CPU 26%.

Next is: user CPU 20%;
then 2 root showing about 12%.

Total CPU is 85-87.8%. Surely this is very very high right and could explain the terrible battery?