By ocelot
Mon Apr 06, 2020 8:39 pm
NearTao wrote:The amperage rating is the maximum amount of power it can supply.
One way to look at it is as if amperage were “taken” (often referred to as “drawn”, as in pulling) by the device being powered. That device will only draw as much amperage as it needs to perform whatever it’s doing. Your computer will use more power, in the form of higher amperage draw, when it’s working hard than when it’s not. (Voltage remains the same regardless.)
Thus, as long as you replace your power supply with one capable of providing as much or more amps than the previous supply, you’ll be fine.
If for some reason your replacement power supply has a lower-than-required maximum amperage rating, you may end up with a burnt out or overheating power supply, and the device itself may not function."
From https://askleo.com/can_i_use_a_charger_that_provides_the_same_voltage_but_a_different_amperage/
thanks for the clarification but this is exactly what i was saying. As long as you provide the minimum amp in the case of mpc one 3.42a you're fine. Even when your power supply can output 10a there is no harm done to the device but with voltage its a different thing....but im repeating myself
no the power bank has an output of 20v/5a
from me again. 
He needs a pimp slappin for sayung that. Pissed me off. 