On here ...
https://www.amazon.co.uk/dp/B00QA8CY1Y/?tag=skimlinks_replacement-20
... it states that the power consumption is 500mA.
With only that kind of draw on a battery a 55Ah battery will last over four days of continuous running so for a few hours brewing I reckon that almost any old 12v car battery that retained a charge would do the job. :thumb:
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