Which type of batteries are used in UPS?

Wet-cell batteries are a traditional type of battery often used in uninterruptible power supplies (UPS). They consist of lead plates immersed in a liquid electrolyte, usually sulfuric acid and water. Their widespread use in UPS systems comes from their ability to deliver high surge currents, making them ideal for applications requiring a reliable short-term power source during outages. These batteries can be recharged and have been a standard for many years, providing a balance of cost-effectiveness and performance.

In contrast, lithium-ion batteries, while increasingly popular due to their higher energy density and lighter weight, have not been the standard choice for all UPS systems. Nickel-Metal Hydride (NiMH) batteries also aren’t typically used in UPS because they do not handle the high current draws as effectively as wet-cell batteries. Lead-acid batteries, while similar in chemistry to wet-cell types, can sometimes refer to sealed units or variations that aren’t used in the same contexts as traditional wet-cells. Each battery type has its own strengths and weaknesses, but wet-cell batteries' proven track record in UPS applications solidifies their role in this specific function.