Let's Make Robots!

Mini battery - need advice

I'm currently working on a small robot with 2 hacked miniservos, attiny45 and some photoresistors. I want the robot to be really small (it's about 6x5cm, 3-4cm tall) so am looking for a power source, that would be both small and efficient. I was thinking about button batteries but it turns out that they can only supply 0.1mA of continous drain.

Thanks for any advice.

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