Dr. Monk does a teardown of a disposable e-cigarette device in a recent blog post.
So what did I find! Well, a lot less than I was expecting! There are just 3 electronic components:
The battery – 5.18Wh cylindrical LiPo. This was still measuring 3.4V
The heating element – showing a cold resistance of 1Ω
What looked like an electret mic insert, but I believe from the wiring, detects the cigarette being sucked, and switches power from the battery to the coil
There was no sign of any microcontroller or protection chip for the battery. The wiring is 0.4mm including insulation and not something that looked like it would cope with 3-4A. Hot wires and a heating element next to a LiPo cell – what could possibly go wrong!
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