@Karam
After reflashed my phone, I installed battery-patch v4 and lastest CSSU. And then I turn off the phone and switch on the boot videos also play very fast.
I uninstalled v4 and installed your batterypatch-for-unstable. My N900 work well and don't have any problem.
I don't know what's wrong with my N900. Am I chose the wrong image flash firmware? (I'm using latest Maemo 5 Global release)

---Edit
@Karam
After tried again I found that I forgot to edit overlock-call and change vdd1 to 0 . And now my N900 having no problems with battery patch v4.
Thank Karam for your supports and batterypatch-for-unstable package.