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It doesn't generally charge to 177v. It usually maxes out in the high 160's or low 170's. The idea of setting it to 177 is so that it will not stop charging.
Once each cell starts to top off, it releases a small amount of heat. At 350ma, this is minimal. Some will reach the top before the others, which is necessary to bring them all up to the same charge.
To gauge when the pack is finished, you'll see that the voltage will stop rising, then slightly drop. At that point, you're good to go. Monitor the charge throughout with a basic DC multimeter. Note also that if you're charging daily, you don't need to do this type of a balancing charge every time.
If you can somehow get your SOC down to 30% (by riding the gas in the hills or using MIMA), it'll take about 9.5 hours to reach 80% (which is as high as the car normally charges). Another 3:45, approximately, will give you the final 20% state of charge, which is extra that what the car will normally supply.
And the DC fuse is a simple fuse inbetween the charger and the positive charge input on the battery rated for 200v DC to make sure that no surge happens that can destroy the battery. I usually solder them in with the diode (which is placed at the battery connections to ensure that no current flows out from the battery and hurts someone).
Hope that helps!
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