AGM versus Gel Batteries
AGM and Gel batteries are often thought of as the same and they do have many of the same characteristics. But, they are not the same in construction, performance or cost.
AGM stands for Absorbent Glass Mat, the construction of this advanced form lead-acid battery. They provide superior power to support the higher electrical demands of today's vehicles and start-stop applications. AGM batteries are resistant to vibration and sealed, making them non-spillable and maintenance-free in terms of maintaining their fluid level.
Gel batteries use a silica gel to hold electrolytes and the thick consistency of the gel allows electrons to flow freely from the plates. They too are maintenance-free but tend to lose power faster than AGM batteries. This is especially true at lower temperatures whereas AGM batteries work well even in extreme weather conditions. Gel batteries make better use of their acid, enhancing their deep discharge capabilities. A Gel battery must also have a different recharge profile and, if not properly charged, they will suffer premature failure.