while on AC power, my t2500 5760 pulls off a 1:12 for 1M calculation on super pi, but when its run off of battery, power significantly drops and it takes a good 1:56 to complete the 1M calculation, and the clock speed of the processor stays the same regardless of power source. Anyone know what exactly is downgrading the performance of the cpu while on battery??

EDIT: not that it matters too much but it was the 2M calculation referred to, not the 1M