Algae Battery Ran For 6 Months Powering a Computer With Photosynthesis

Although it's only a NanoPC, the battery is relatively small, or tiny even.
 
When I read the title I expected they might have used a much larger tank of algae
Never imagined so much electricity from such small amount of algae.

Imagine a PC with a watercooling system that grows algae to make electricity to power itself. 
Even if it could only provide for example 50% of the needed power, it would still be useful.