Clock [MHz] Time [s] when Pi calculation finished average current consumption [mA?] So here it goes: 500 49 556 600 41 560 850 31 609 1000 25 736 My conclusion at the moment though is that a higher clock (even with lowered voltage) isn't necessarily more battery friendly than a lower clock just because it allows the CPU to complete its tasks faster and have more sleep time. This is probably because at higher clocks it consumes so much more power that it's not worth it... anyway I'll also have to check how the CPU behaves at 125MHz and 250MHz... At the moment 600MHz seems to be most effective clock though.