Well that's a new level of cheapness lol. Fixing a toy for the kid and the LED doesn't even have a series resistor.
It runs straight off three LR44 batteries and just relies on their ESR to limit current.
And it's not soldered either it's just clamped in place by the plastic body with one side pushing against the negative battery electrode and the positive side of the battery holder - which doubles as the switch - is bent into place to make contact with the LED lead.
No solder. No wires. Literally not a single part you could delete or simplify and have it still work at all.






