Is charging in cold safe?

[TheWoo]

after I reach my targeted % should I keep it plugged in? Is there any benefit for keeping it plugged in? If I want to precondition, I would just plug it back in so do I really need to keep it plugged in?

Leave it plugged in. It stops charging once at your target level, so there is no damage, and it’s already plugged in for preconditioning. Plus, when cold, it’ll draw enough juice to keep the battery from getting really cold, which increases performance and is better for the battery overall.

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[lightspeed]

I could be wrong, but I think at 120v the mobile EVSE only draws 12 amps, the intent being to keep it from tripping a standard 15 amp breaker.
The annoying part is that it should be enough to keep the pack warm even if there's next to nothing left to add energy to the battery.

Hard to say. Depends on how cold. 120v@12amps is only 1440 watts when the battery heater can get up to 8000 watts or more (I'm not sure what the upper limit is).