A battery seal is a safety device that tightly seals a battery to prevent the loss of electrolytes. It is sealed to the cell by means of radial crimping pressure or by impact.
Sealed car batteries, also known as gel-cell batteries, are a type of sealed lead acid batteries. They were considered one of the most powerful rechargeable batteries on the market as of 2007. Sealed car batteries tend to be quite heavy primarily due to the lead inside.
A battery's cell gasket is sealed by means of radial crimping pressure or impact. It incorporates a vent mechanism to release pressure and protect against cell rupture and damage in the event of misuse under abusive conditions.