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Semi-auto causes the most amount of arcing per shot with the switch assembly vs. full auto. That leads to burning out your switch assembly.
"Big" batteries provide a lot of power, which in a normal setup travels through the switch assembly, and with arcing will contribute to burning out your switch assembly. Big benefit to a big batteries is really quick trigger response. With a 11.1v LiPo...the shot is very close to immediate when the trigger is pulled.
Depending on your gearing ratio, battery, motor, spring power, shimming, etc...your piston will come to rest somewhere between fully forward and most of the way back. Sort of "pre-cocking" the piston...but really unreliable. With repeated semi shots...the stopping point should be the same shot to shot. On one setup I had, the piston was consistently coming to rest about 80% of the way back after each semi-auto shot. In full auto, with pretty much any AEG, the piston rest position will be completely random.
A mosfet senses a very low voltage across the switch assembly and then "dumps" power to the motor (probably not the exact proper electrical way to describe it). The current/voltage that the motor needs, doesn't go through the switch...it's fed directly from the Mosfet chip. So, regardless of how many shots in semi/otherwise...your switch assembly will basically last for ever.
A mosfet with active breaking essentially senses when the switch assembly is disconnected by the cutoff lever and "freezes" the motor to stop the gears from rotating further. This will result in a consistent/predictable shot to shot trigger/lag time...and when storing your AEG, a couple of shots with active breaking will result in the piston being left as far forward as possible and thus not storing the spring in a compressed state (which will kill off its power).
Computerized mosfets (i.e. triggermaster III) have additional features such as, semi auto only, 3rd burst, speed up/slow down motor, etc....
Hope that helps,
Tys
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