Arduino nano battery power?

Hello

I am currently working on a project that involves the arduino Nano controlling four servos but I need it to be powered by the lightest possible battery to save weight. The battery only has to last for about 20 mins before running out. Can I buy such a battery somewhere?

Thanks

That's potentially 1300mAH of capacity needed (4 AH x 1/3 hour).
1500mAH LiIon powering Nano directly with boost regulator to power the servos?
Check www.pololu.org for boost regulators.

I'd think that the servos consume more power than the Arduino. How much in total?