problem with battery after downgrading from ics

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So, I had cm7 2.7. Some time ago I've installed nova hd, then nova hd plus. Because some features that I needed wasn't working on ICS, I decided to downgrade back to 2.7. I've installed clear nightles build of cm7, then after week MIUI. Both on custom OC kernel (i tryed 2 different kernels). After downgrading, on both roms i had battery issue - it showing 100%, after whole night charging, then - 30min later, after using 3g it shows 50! So, I'm plugging it back, and after 5min there is 90%...
I've tried few times;
- calibrate battery (tryed 2 apps)
- clear battery stats in recovery

currently I'm running on latest MIUI and SwiftExtreme-PowerSaving-hoc-20112011 kernel.
battery : gold battery for p990 2430mAh

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