Dual output interface charging bank, can double charge? Must be able to double charge.
What's the result? You can charge two phones at the same time.
At present, most of the charging banks on the market have two USB outputs, most of the two outputs, one is two 5V2A outputs, one is a fast charge output (your charging bank is compatible with a variety of fast charge modes) and a 5V2A output.
Some high-end charging banks, both interfaces support fast charging. The charging bank itself also supports fast charging function.