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Hi Mark....
The best way to do this (in my view) is use a bridge rectifier...
as long as you wire up the output of the rectifier correctly to start with, it does not matter which way you connect the battery.
These are really cheap - i don't know why they are not on the input stage of any dc device....
especially on things like my scope, which will blow the control board if it goes on the wrong way....
the next simplest is just a diode on the +ve side....if you connect the battery the wrong way it will simply not flow any current at all...
In fact thats exactly how my ciggie lighter socket power supply works...
15A is probably overkill, but there is not much difference in price between devices, so take your pick!
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