Bizarre USB charging issue

Factual Questions
1

Hello Everyone,

I have an E cigarette that I occasionally use when I feel the need for some nicotine. To charge it I have several chargers available, both house and car. Each charger has a charger that plugs into either the wall or power plug in a car. You plug a separate cord into the charger then into the device,

Here’s where it gets weird. If I plug the device into the car it will charge to full everyrime. If I plug it into the wall, it charges only for a few minutes then stops changing. Unplug it, replug it in and it charges for a few minutes then stops.

This happens regardless of charger or cord. I’ve switched them in all combinations and the result is the same. Why will the device charge in a car, but not in the house?

2

It’s cheap junk, that’s why.

I would guess that it overheats and shuts down when dropping 120v AC down to the charging voltage, but works just fine on 12v DC.

3

You may find this video interesting.

4

Thanks, the 12v DC vs 120v AC makes sense.