4.2v per cell is peak voltage, so 8.4v for a 2S pack
What amps you use is dependant on the capacity and recommended charge rate for the battery itself, but 1C (5amps for a 5000maH battery, 3.8 for a 3800 etc) is a good setting to use.
I've not seen any setting on when to stop the charge (other chargers, not the pro-trak) so can't help with that bit, sorry
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