Simplest power bank ever?

This somewhat exaggerated power bank has one of the simplest circuit boards I've seen yet. Just 5 components and the connectors.
To keep the chip's pin count low it uses the arrangement of the charge and output USB sockets in parallel. That means that it has to dip the voltage briefly every couple of seconds to check if a charger has been connected. That results in a very short, but noticeable pulse in the output if a light is connected.
The chip also detects if the load is low and will switch off into a standby mode. Not great for low current loads like low power lights. The one plus feature it has is a very low quiescent current of 11uA when it does go into standby. The stay-on current is 40mA and above.
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