Default [Q] Battery stats broken, unable to reset

Hey there,
hope you guys can help me out on this:

For about 3 weeks, my battery is going crazy. The statistics won't reset even after a 100% charge (see picture). Battery seems to drain way too fast. Sometimes, charging will get stuck at 66% or something (unplugging + plug back in doesn't help). Or it will jump from 89% to 100%, and will remain at 100% when the charger is unplugged, but jump back to 89% after a reboot.

Long story short: I think I need to reset something here. But I'm not entirely sure what else to try. I've erased the batterystats.bin using the Battery Calibration app multiple times. I've tried to do a battery wipe in recovery mode, but my CWM doesn't show that option. I've done several 100% to 0% to 100% complete charge cycles. Even bought a new battery. Without any effect. Kind of clueless

Running Cyanogen 10.2 on Galaxy S2
Glad for any help!! Thanks!
Max
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