How to choose the right battery for data center?

Time of issue:2023-05-13



For data center operators, there is no "best" battery technology. Each battery has its own advantages and disadvantages, and operators should choose the most suitable battery products according to their requirements.


Today, lead-acid batteries are still very popular because of their proven track record in reliability. For large-scale applications, they are the most economical choice, with excellent performance and efficiency, low internal impedance, high tolerance to improper handling, and high procurement costs. 

The electrolyte used in lead-acid batteries includes water and sulfuric acid, as well as plates made of sponge lead (negative) and lead oxide (anode). The main battery type of lead-acid batteries is valve-regulated lead-acid batteries, also known as "sealed" or "maintenance-free" batteries.


Valve-regulated lead-acid batteries are sealed, but there is a valve that can discharge the gas accumulated inside to the atmosphere. Normally, there is no need for direct maintenance and no need to add water, because the hydrogen released during charging will recombine with oxygen inside to form water. There are two main types of valve-regulated lead-acid batteries on the market. The difference lies in the electrolyte mixture: the electrolyte of the glass microfiber separator battery is held in the highly porous microfiber glass separator; while the electrolyte gel of the gel battery is composed of sulfuric acid and two Composition of a mixture of silicon oxide.

UPS power supply usually uses AGM type sealed valve-regulated lead-acid batteries because it has lower internal resistance, higher specific power and efficiency, lower self-discharge rate and lower purchase cost. The glass microfiber separator battery has a faster charging speed and can provide a large current for a short time.

The plates of flooded lead-acid batteries are immersed in acid electrolyte. Since there is no seal, the hydrogen generated during operation will be directly discharged into the environment, and the ventilation system must be more powerful than the sealed valve-regulated lead-acid battery. In most cases, the battery pack is housed in a dedicated room. Flooded lead-acid batteries must be kept upright in operation, and the water level must be filled up manually.

Compared with sealed valve-regulated lead-acid batteries, they have a longer service life and higher reliability. The battery room of lead-acid batteries must be kept at a reasonably constant temperature (20℃-25℃) to avoid shortening the service life and even causing damage.