LiitoKala Lii-S2 charger.
Defective: it powers on but indicates a charging process even when the slots are empty.
Diagnosis from LLM: "In LiitoKala models, the MOSFET or Schottky diode in the power circuit for a specific slot often fails (shorts out). Using the device in this state is unsafe; the burnt component needs to be resoldered, or the charger must be replaced."
Free, Limassol.