It is still a mystery to me because I don't manually change the setting at the field because of the built in memory. The charger has a memory for 20 different settings. I have two settings for each of my lipos labeled by plane and number. One when I'm charging from the car battery (some of my larger Hyperion lipos start charging at 20 amps) and one setting for when I'm using the ciggarette lighter. I have to limit the charge to a max of 10 amps when using the ciggarette lighter adaptor because the car will only feed the ciggarette lighter socket at a max of 10 amps. So, I will admit there are times when my "thumbs" make mistakes while flying but I could not have changed any setting while charging.
Another thing to add to the mystery is that it says right on the front of the charger that input voltage can be from 11 volts to 28 volts and when my engine was running the charger was showing an input voltage of only 14 volts.
The only other thing I can think of is that my freind, the club member says that it is the variation of input voltage that his charger doesn't like. Perhaps the charging input of the car charging system is doing something? I can't think of anything else that may have caused the problem.
Who knows for sure but I may try charging again with the engine running (while I'm standing there watching like a hawk) just to see what happens.
In any event, the charger is working now so far with the engine off and I'm happy...
Now if only my wife would let me buy that $750 sailplane I want to get without giving me "that look"! I'm sure all you married pilots out there have gotten "that look"!