Considering the planes that have been brought down by failing laptop batteries, and other disastrous fires started by them, if my laptop were 'Hissing' at me, in milliseconds it would be laying out in the yard.
I have one of those modern, thin, laptops, like the one mentioned above. The battery is a 'Flat Pack' buried down inside of the unit.
Not easily removed. If memory serves, the 10 screws that have to be removed to free up the bottom panel, are not your standard straight or Phillips screws. But a very small "Jeweler's" size Phillips and six are definitely Under the rubber 'Feet' on the bottom.
The person who gave me this laptop called it a "Throw Away" device, and he was glad enough to get rid of it.
I HAVE had it apart, after watching a vid. on U-Tube as to how to get it apart. The guy started out his work with a metal kitchen spatula, which he traded for a pocket knife, that he used to separate the two halves of the case.
Not my idea of Computer repair work!