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Well, you can multiple amps x volts to get watts and then math that way. In a real world there is always losses as to why I guestimated the run time.
So you could say 1 bat is 36 watts, 12 bats is 12 x 36 is 432 watts
Raspberry pi is 5 volts x 1.2 amps or 6 watts
432 / 6 is 72 hours, assuming no losses and all bats are fully charged and have full capacity.
There are a few different raspberry pis out there and some use less power than others. Then you got the accessories and such. A NAS drive you got to take into account what the drives use too or if you use it to mine bit coins need to take into account the dongles power consumption.
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