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On the market, there are different types and shapes of batteries applied to different industries. Among them, the lead-acid battery is the earliest type of rechargeable battery and has been widely used in various applications. Nowadays, the lead-acid battery can be mainly classified into two types, namely the VRLA battery and VLA battery.
The VRLA battery is short for valve regulated lead-acid battery, also sometimes called as the sealed lead-acid battery (SLA battery), a kind of lead-acid battery featured by the limited amount of electrolyte absorbed in a plate separator or formed into a gel. In all types of VRLA batteries, they have the same chemistry as the lead-acid batteries that contain two plates of lead to serve as electrodes and suspend in the immobilized electrolyte diluted sulfuric acid.
When it comes to discharging, the lead and diluted acid will have a chemical reaction and produce lead sulfate and water. Reversely, when the lead sulfate and water turn back into lead and acid, then it means it’s on the charge. The charging current should match the capacity of the battery to absorb energy otherwise the damage will be caused to the battery and reduce its using life.
When high charging current happens, electrolysis will occur and decompose water into gases like hydrogen and oxygen. VRLA battery retains these generated gases within the battery if the pressure remains within a safe level and if the pressure exceeds the limits, then the safety valve will function and let the excess gases go and regulate the pressure back to normal. The safety valve function when the battery starts to build pressure of gases, namely when the battery is being recharged.
The VRLA battery contains two types of battery, AGM (Absorbent Glass Mat) battery, and Gel battery.
1. For the AGM battery, the electrolyte is suspended in the thin fiberglass mat and separates the plates. The advantages for AGM is that it can work in a various range of temperature condition and it is vibration-resistant so it’s good to apply to mobile applications.
2. For Gel battery, the silica dust added to the electrolyte can form a thick putty such as gel. The difference between gel battery and AGM battery is the charge rate lower than the latter one. However, the gel battery can be widely used to hot temperature condition such as solar system to reach its full performance.
The VLA battery is short for flooded vented lead-acid battery. Unlike the VRLA battery, it doesn’t need a special pressure-relief valve. On the contrary, it utilizes a vent to allow gas to escape which in other words when choosing flooded vented lead-acid battery it needs to be vented the toxic hydrogen gas to the outside to avoid being trapped. The electrolyte it contained is free to move around in the battery encasement and the acid and leas plates to react to generate electricity.
Both VRLA and VLA lead-acid battery have their own specific applications and choose the right one based on their features can help you to reach the long-run situation and save cost.