What’s the difference between a conventional, gel, AGM, and lithium battery?
We answer this exact question, so for the best answer to this question, make sure to check it out. But for a quick rundown, here are the basic differences:
Conventional: also called flooded cell batteries, these are the “old school” type of lead-acid batteries that have been around for over a century. They are made out of a case holding a series of lead plates soaking in an acid solution known as electrolyte, and energy is created by a chemical reaction that occurs between them. They are very reliable and the cheapest of all battery types, but they do require maintenance, are a little unsafe to use since they are filled with corrosive acid, and don’t perform as well as newer varieties of batteries.
Gel Battery: these work in the same way as conventional batteries, but they use a gel form of electrolyte instead of the liquid battery acid that conventional batteries use. They aren’t typically used as starting batteries however – they are actually best used where deep-cycling batteries are needed, like in marine and solar power storage applications. These are often confused with AGM batteries however, and you do sometimes hear people refer to AGMs as “gel batteries” incorrectly. (One exception is BikeMaster's TruGel line, which does use a gel electrolyte, but with AGM construction, and is more accurately described as an AGM battery.)
AGM: AGM stands for “absorbed glass mat,” and uses the same chemical reaction as other lead-acid batteries, but uses fiberglass mats to hold the electrolyte in place rather than letting it flow freely like in a flooded cell. These are the most modern type of lead-acid batteries, and perform very well, last a long time, are safer to use, and will work in virtually any weather conditions.
Lithium: Lithium (technically lithium-iron-phosphate) batteries are very unlike lead-acid batteries in that they don’t use any lead or acid in their constructions, but rather, completely dry lithium based cells that create power in a completely different way. Lithium batteries are super light and high performance.Source: Bike Bandit