I've had 2 of these for a week. Suddenly today BOTH of them started having problems. When I hit it it tastes burnt, like I'm dry hitting it, even though the tank is full. After a few seconds the light flashes 3 times on the battery. I replaced the coil in one of them, but it didn't fix it. I've also tried both tanks on both batteries and the same problem happens. I'm so confused why this happened to both at the same time! The only thing I did differently is I plugged them into the laptop at work to charge it, instead of my laptop at home or the wall plug. It is possible I fried the batteries or something? TIA!