unexpected teardown time: My roommate's imini vape exploded and she asked if I could fix it.

The answer, it turns out, is "no"

So the vape cartridge plus into the other side of this connector.
Turns out this is a "510 battery connector"
You'll see it only has one wire connecting to it right now: that's one of the main reasons it doesn't work

This PCB at the end is the only smarts. It's got a button on one side, some LEDs, and a micro-USB plug.

Top of that PCB. We've got an anonymous 8-bit microcontroller, something else, and some resistors

Flipping it over, we've got some LEDs, the microUSB connector, a button, a 6-pin IC, and G/V/O+ connectors.

It looks like V goes to the battery+, G goes to the battery - and one pin on the 510, and O+ goes to the other pin.

Speaking of the battery, it says HK 13350. That's a cylindrical lithium-ion battery, and "13350" means it's 50mm long, and 13.3mm in diameter.
3.7V, and 1.67 watt-hours. (which'd be 451 mAh)

So, time to pull out the USB microscope for the chips and such.
That one on the top is an A1LA MK... which is a mosfet.
Probably used to control the main power through the 510 connector.

This other 6-pin IC is a 57bD. I can't be sure, but there's a couple dual-transistors in that package with similar names, so probably a transistor.
A grimy one. ewwww

This here is a multi-color LED.
I like how you can see the tiny wires between the contacts.
I think this is two colors?