text:  heat up or malfunction that should cut power and not have a problem unless you've had mechanical damage to it. But some of these overseas batteries, they have none of that protection. So if you leave it on the charger too long or put it on the wrong charger, it can just, as it heats up, it just keeps heating up. We call it thermal runaway and then we end up with a fire pretty quick. With that, is if you have damaged lithium ion batteries, I wouldn't charge them. I would recycle them as a