Yes it is a lot.

About the engine stopping when the key is turned off. This is odd. I am
not really familiar with outboards but these symptoms would seem to
indicate an electrical charging problem. When running is the battery
charging or are the engine's electrics being supplied by the battery?
Check the voltage on the battery when the engine is stopped and when
running. When stopped it could be between 11 and 14 volts (not usually
as high at 14 though unless only just fully charged). When running the
engine should be charging the battery and the voltage should be close to
14 volts. If not it is not charging you key being switched to off must
be removing the only power (the battery) from the engine which is
probably only for the sparks.