> In my very limited experience, if they are advertising 2 volt 500mA cells,
> they *usually* mean that the cells produce 2 volts OPEN CIRCUIT (ie,
> current = 0) OR 500mA SHORT CIRCUIT (voltage = 0) but not both at the same
> time. If so, then you won't get anything like a watt out of them.

2 V open + 0.5 A short => 4 Ohm impedance, so max (external!) power is with
4 Ohm load => half the short current, haf the open voltage => 0.5 Watt.

Wouter van Ooijen

Van Ooijen Technische Informatica: http://www.voti.nl
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