Your phone controls how fast it's being charged depending on
the available amperage of what's being plugged into it.
Taking 90A off of this would be a large chunk of the overall
available amperage, but it is doable.
Not exact matches
You will not blow anything by having additional
amperage (cranking capacity)
available to your starter.
You just get more
amperage flowing to your battery which will charge it up faster and send more energy to the starter motor which will make it easier to start because the motor will turn faster because it has more amps
available.