Gel cell and AGM batteries are similar as they both utilize a suspended electrolyte in close proximity to the internal plates. They are substantially more expensive than wet-cell batteries, but they offer some distinct advantages. They do not degrade as readily as a wet cell, do not outgas as much as a wet cell, do not leak or spill acid, and can be mounted anywhere in a vehicle and in almost any orientation. These facts make these batteries the choice when it must be mounted inside a passenger cab or when you want to ensure electrolyte does not leak under rough riding conditions. These batteries are also well suited for applications where the vehicle is not used on a daily or regular basis, due to their superior charge retention properties.