hey!
the battery, nah i dont think so really cuz it save the memory timings and also the voltage, it is just the cpu back to 266 :( ...
maybe is cuz the memory isnt 1:1 could be that but why though? about memory voltages i got it on 2.4v just for testing i am pretty sure it can works well...
so you updated bios and it save frequencies ??? i dont know i tried all my settings cuz it seems to work better like that.. but i got that problem when i reboot i got it returned to stock frequencies
so do you think is the bios then ?