The Sealed gel battery is a VRLA (valve regulated lead acid) battery, which is a sealed acid battery. The technology used to make gel batteries is similar to AGM batteries. However, instead of the absorbent glass material used in AGM batteries, gel batteries use a gel electrolyte. The solidified electrolyte reduces the risk of spillage and evaporation which can lead to corrosion problems.

    Compared with ordinary batteries, gel batteries are much lighter. The technology uses only a small amount of solidified electrolyte to keep the acid stationary. Gel batteries last longer than conventional batteries; this is because the gel solution can be held for longer. This battery type is also durable and can withstand extreme temperature ranges.

    Gel batteries are commonly used in cell phones, cameras, motorcycles, and marine equipment. It is also used in high-end cars. Due to its low maintenance nature, the user does not have to regularly add water to the battery to ensure proper electrolyte level. Gel car batteries have lower acidity than regular deep cycle car batteries. As the electrolyte solution turns into a gel, it is nearly impossible to spill the contents, preventing any acid from seeping out.

    There are certain limitations when charging gel batteries. To prevent excessive gas formation inside the batteries, the user must charge them at a slower rate. These batteries must be charged at a lower voltage to prevent overcharging. Overcharging a gel battery can cause it to become permanently porous, which will affect the battery's lifespan.

    Changshu Wanlong Power Technology R&D Co., Ltd. is a lead acid battery manufacturer from China. The company sells 12v deep cycle gel batteries all year round.