Unfortunately 18mv on Much More is a big no no and asking for a loud bang to go off...

A setting of 03 is around the mark for 4200's

Check out the Nexus Racing site for a good explanation as to the difference and correct settings for Much More charger.

http://nexusracing.net/newsdesk_info.php?newsdesk_id=29

Temp cutoffs are really a great backup and i make sure to always have the sensor attached to the pack just in case

Ryan