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WTF Makita?!
makita.biz/product/category/cÂordless/dcm500/index.html#1
500ml brewing capacity off of an entire high capacity battery.
Physics innit.
Energy in high capacity battery = 18V * 5Ah = 324000 J
Water has a specific heat capacity of 4.18J per gram per deg C so to raise 500 ml of water up 85 deg C (from 15 deg C to boiling) requires:-
4.18 * 500 * 85 = 177650 J
I'd expect ~80% efficiency for a standard kettle so I'm guessing they're erring on the side of caution and the battery will be 80% spent after boiling the suggested amount.
Greenbank
WTF Makita?!
http://www.makita.biz/product/category/cordless/dcm500/index.html#1
500ml brewing capacity off of an entire high capacity battery.