My 10,000mAh powerbank has a warning printed both on the case and in the manual:
"Do not use with wall chargers that exceed 1A output"
by which it is referring to when we need to recharge the powerbank itself via its USB-like input port.
My question is, isn't the charging controller inside this thing supposed to limit the charging current? Surely they didn't wire up the lithium battery directly to the input port? Obeying the directive would be quite inconvenient, as pretty much all of my chargers have 2.1A max output ports.