Quote:
Originally Posted by theducks
A power bank is just another source of 5V (USB power). It is no different than a Wall or Car charger (assumes decent quality) The device uses 5V to set/control the charge rate of the battery, It has no sense of what is making the 5V as long as it supplies it at the needed current (some device drop to trickle mode if the source is standard 500ma computer port)
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Not really «just another», and only under the "decent quality" assumption in fact: the voltage is always 5V, by specification (unless something is horribly wrong), but
the amperage may vary, and the battery management electronics in the device may behave differently (e.g. some, and only some devices of mine will notice if USB-computer-port-connected instead of wall-charger connected and notify "something's wrong here") and your in-charge battery may not like that.
So, yes, admittedly (I may have been misleading), if the power source is fully "competent" it does not matter if it is portable. But a few of my power banks have not been so.
EDIT: to the interested, I remember Battery University as a good source: batteryuniversity.com/learn/