Dangerous Li-Ion charger for 18650 (and AA) cells
(Reverse Engineered Schematics)
Schematic of a Chinese 3.7V Li-Ion / Li-Pol mains charger for 18650 (and also AA) rechargeable cells. Very simple switching power supply with just a single transistor 13001 and a single half-wave rectifier. No fuse, no inrush resistor, no EMI filter, no snubber network on primary winding. Very poor isolation in the transformer and on the PCB board. Totally non-compliant in EU, US, UK, etc. Contains HT3582DM Li-Ion charging controller chip with red/green LED indicator and automatic polarity detection. The cell can be inserted both ways around.
Photo of dangerous Li-Ion charger for 18650 (and AA) cells
PCB board from bottom. No apparent isolation line. Primary and secondary tracks are spaced less than 1mm.
PCB board - component side.
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