You can order 1 or 2 (even different) batteries at the same load. The small all-rounder automatically recognizes lots of different types. He allegedly also has an overcharge protection.
The shortcoming that some smaller / cheaper Chargers: if you insert a charged battery again, simply start the charging process again from the beginning, since the charge is not checked (function maybe just my time?) - This is not the case here. Full is full and will also appear so.
The display is kept very simple, 3 LEDs (corresponding to about 1/3 full) flash during charging and make a continuous illumination when full.
Practical - on the side is still a USB plug place, eg for charging mobile. Shortcoming - here you can only load when batteries are full in the shell