[gus_massa]

A normal chess match last about 4 hours. If we divide proportionally the energy of the day, that will be about 400Wh. I remember a factoid that says that the brain consume the 20% of the energy of the body at rest (less % while running) (more % while thinking?), so if we cut the unnecessary stuff [0] that will be 80Wh, i.e. 10 batteries. Probably the phone is more efficient.

[0] Don't try this at home.

[chongli]

So 10 batteries... how long do you think the engine could last on one battery? Then we multiply that number by 10 and see if it's less than 4 hours... hmmm