Fully charged is 4.2v/cell so for a 4S lipo, fully charged voltage will be 16.8v. I think you misunderstood the lhs - or they were wrong. If you're using the lipo charge on the Ice charger, it will charge at constant current (your input 3.3a) until the voltage reaches 16.8v. Then it will finish the charge holding that voltage constant (CC/CV type charge for lipo) until capacity is reached. You can watch as current goes down til it quits in this 2nd stage.
Stop worrying about blowing it up, you'd have to hit with a lot, lot more voltage and current to make it do that - thats mostly just misinformation about them blowing up. Follow precautions, charge like recommended and you will not have probs.
Confusion is over way lipo is rated - there is a nominal voltage of 3.7v/cell - thats the 14.8v nominal voltage for a 4S. Fully charged is 4.2v/cell. Minimum is 3v/cell. Go find your Ice manual, look at pg 11 part 1b. Wouldn't hurt to read items 2 - 13 for any comments about lipo either.
My 2S lipos charge to 8.4v, not 7.4v nominal. My 3S charges to 12.6v not 11.1v (again, 11.1v is nominal voltage).