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The opus will drain your battery FLAT.. it has no protection against draining your battery whilst its turned off, it drains it by supplying your MB with a constant current even when off. The protection it does have is that it will power down your MB if its turned on and the car battery drops below a certain voltage.
I went through 2 batterys with this.. I now run a M2 and i'm nearly happy.. lol
CdR
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