I just programmed out my rain-sensing wipers to a standard delay using NCS expert. I did it quickly by turning the key to position 2 (no start) and coding off just the well-charged battery. I had planned what i was going to do and was quick, but I was still nervous the whole time. I read codes - turn off- modify script in NCS off-line - tuned ignition back on - write the codes - turn off.

Usually, I plug in my battery charger on the "jump" setting (maybe 60 amps?). As you noted, a low-amp trickle charge is not what you want.