Jim Macklin wrote:
Because they are different. The automotive charger is high
amperage and the plates on the aircraft battery will be
distorted by the high current. A trickle charger on "high"
is about a maximum charge rate for an aircraft battery. But
you are free to use any charger you want.

My auto charger has a setting for 2A, 10A and 50A boost. Why won't the
2A auto charger work?

Matt