The 1-10 amp charging mode is convenient for situations where you don't need to rush to fully charge your bike. This will extend the battery life.
It is convenient if your outlet does not give out much power.
You can use one charger for different batteries which has same parallel qty(20s li-ion).
Automatic transition to standby mode at the end of the charge.
Defence from:
short circuit
overload (both the battery and the charger itself)
overcharge
overvoltage
high temperatures