Hi, and welcome. Are you using a different charging cable with your computer? I was told not to use a wall wart, (I think some of them output too much power) and typically, unless it's an internal battery, you want an external charger (you can pick one up for about $30--40 or less and it's well worth the investment) as it's easier on the batteries, the mod, and you do run the risk of your USB port breaking, which, unless you know how to replace it, will ruin the mod. It's my understanding that some of the smok products don't do so well with USB charging the batteries evenly either (I can't remember where I heard that but I did).
Can you say more about your make/model setup, how long have you had it, how long have you been charging via passthrough and how old your batteries (or battery) are/is? That would be helpful in directing you to the safest method of charging. I don't use any wall warts unless they come specifically with the mod, as many of the high speed chargers these days are drawing way too much current from the wall to safely charge your mod, so unless it was specifically for THAT device, I'm not exactly surprised it stopped charging.
It may end up being worthwhile to replace your batteries in any case, since you may have overstressed them already (what once was working now is not, and etc.)
Best of luck, do provide a bit more information if you can. If you want more info on batteries generally, here is a great place to start:
Mooch's blog | E-Cigarette Forum
Best of luck and welcome to ECF!
Anna