The "batterypatch", it extends the life significantly.

Using a Battery "1420mAh SCUD," with phone use as 2G, WiFi, 3G data, installing applications, etc ... with average usage lasted from a Friday at 6:00 am until Sunday at 2:00 am. There is still 8% of the battery.

KP V49, batterypatch and speedpatch in their latest versions.

Finally I uninstalled the batterypatch to check the duration without it and because the N900 becomes very slow going from sleep, especially QTLockscreen.