Depends on where you're operating and if you have back up crews to assist...
If you're in the Amazon jungle I would definately. The more remote the longer you will have to wait for a ride or a fix, which can be rather
sometimes. We've always carried one into the bush to leave at the main camp for the 1st start of the day when everything is still cold. Also, we disconnect the battery when we're not using the machine for a few hrs. This way you're guaranteed not to have a dead battery because you left a master/light on.
have a first class aircraft battery
and well maintained, and keep your eyes on it - know when it is in need of a deep cycle.
As for:
If you're operating single pilot in the field, after a GPU engine/rotor start, who disconnects the plug and stows the unit?
in the real world, us helicopter pilots tend to have to do everything ourselves....
Often we don't have the luxury of landing at a big H on the ground with people to help.