The Most Dangerous Battery

I do not know if it is the World's Dangerous Battery. There are other forms of stored energy that has much more catastrophic effect than this but this battery does burn up into flames if overcharged. So that means if you leave your remote control planes, cars, helicopters etc, charged for too long, you will create fire.

I wonder if phone batteries flame up if it is left to over charged for too long..... hmmm.... come to think of it, how about my laptop battery?