Comment Re:power saving tip: disable the optical drive (Score 1) 907
oops, I meant my comment for the parent.
A 12v battery. I never knew DC was more efficient than AC! WOW GOOGLE IS SO COOL!
I'm not sure if you are being sarcastic. A 12v battery in the power supply is more efficient than taking DC -> AC -> DC. That is what a UPS does, each conversion introduces loss. Having the battery in the power supply means there is no conversion so less power loss.
Always draw your curves, then plot your reading.