A VTC5 is rated at 20 amp continuous, assuming you are getting 3.7V you will be drawing 19.4 amps, personally that is a little close for my comfort.
But to answer your question, a mech should fire anything you throw at it, there's no safety
Are you using the Karma RDTA?
Thanks
Does this chart below look correct to what i am doing? (did i put the resistance in correctly?)
Appreciate the help