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Originally Posted by Sven
I wouldn't be too concerned though, because likely if you are cobbling together a cable to hook to a GPS, you are dealing with a unit that probably runs off 2-4 1.5v batteries anyway.
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I agree that I should be careful, but how many batteries a device has usually has very little to do with what voltage it operates at or can tolerate, since they almost always have some kind of step-up or step-down converter on them and of course the I/O ports always operate at completely different voltages. For example, my h2215 has a 3.7V battery but the USB port runs at 5V.
Robb