How to use variable AC/DC power supply

Hi, I bought a variable voltage variable amp power supply to use
charging my RC batteries:
http://shop.vendio.com/evan2002/item/857080628/index.html

I don't really understand it much though. First, should I never turn
it on if there is no load?

I will use it with either a nicd/nimh charger or a lipoly charger. In
either case, should I turn the voltage to 12 volts, and the amps to
the maximum (10), then turn on the charger? Should the charger be
hooked up and turned on with a battery connected to be charged, before
I turn on the power supply?

Thanks very much in advance for any guidance.

Jim

.

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