opps forget to add that my phone now on 1850mAh battery as well.
Normally at Sleep(phone with data) takes around 20 minutes to drop 1%
after new modem, takes >30 minutes, one think I notice is when not using any data, it will fall back to normal 3g only when you use data it will switch on HSDPA, unlike last time the phone will always be on HSDPA
Btw, I started with KF1, tested ok with HSDPA,3g and 2g
when go to KB3, weird things happen

at first HSDPA was working, then when force to 2g, it stays there forever even after reboot, reflash KB3 and I never got back HSDPA or even 3g.
So went back on KF1 and never look back

wahh nice, tonight I will flash it too.. owh wanna ask where do u buy that battery?