Shy torque,
in general, you may be right but this carries the assumption that manufacturers are doctors doctors in everything, and that's not the case talking about Agusta.
But honestly, I've been going on with that startup procedure since around 2008 and there's nothing to be worried about in starting the bird in that way, specially if working (I say working, not hauling from A to B where A and B are well served aerodromes).
Regarding battery charging option and Tottigol: again, since first release to service with whose ****ting OEM batteries equipping the short noses birds, that was one of the ways to have some more juice in the battery theirselves when really doing the job the helicopter was supposed to do according to Agusta.
Job that was definitely out of the reach of the 139 without a little help from the operators (because Agusta didn't know any **** about how to operate the helicopter off airports), hence somebody of us had to go on and think it all the way around to skip the option to be forced to stay overnight on a freezing pinnacle at 4000 meters without appropriate gear in the cargo hold.
This wouldn't be happening with an Airbus H145 for sure.