The charger works first by loading my 14500er Li-ion Akuus. If you connect it to a USB AC adapter that can deliver 1A or more electricity (eg iPhone / Smartphone USB power adapter) use actually 1A it, with smaller batteries as 14500 only with max. 500mA load. The recognition works like this: touching the sliding minus the spring, it loads with 1A, otherwise only 500mA. Care: If two batteries are charged at the same time, everyone gets the shaft maximum 500mA, no matter what type of battery is being charged.
It also has a looped-through USB port to simultaneously charge via a USB port both batteries as also to use another USB device (eg USB flash drive) or to load, which can be set via a Schlater the charger, which first consumer to be operated when the current is not sufficient for both.
The charge level indicator confused but: At least with my fresh 14500ern it remains at 97% and are implying flashing top bar that would continue to charge. However, it is not loaded, but in aid only minimal float current delivered. It seems to affect not only just my copy, but the user experience reports in online forums, according to some (if not all?). So, 97% and Ladeanimation (elsewhere I have already read of 94%) is in doubt, "full".
For my purposes, this flaw is not a showstopper, but nice I do not find that now, why only 3 stars. (Changed to 4 stars, see Addendum ....)
Addendum: The confusing percent display seems to be connected with the usual minimum voltage fluctuations in the power grid. Furthermore, the behavior can also from the technical specifications for products in the form of "Output voltage: 4.2V ± 1% / 5V" (plus / minus 1% tolerance) are derived. Some days it shows that is also 100% so I think 4 stars for a fairer rating.