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Batteries are an essential and critical component of any UPS (Uninterruptible Power Supply) system. They are also one of the most vulnerable parts of the system, and battery failure is one of the leading causes of power loss. Proper maintenance and management of UPS batteries can significantly extend their service life and help prevent costly failures and downtime.
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There are several types of batteries used in UPS systems. One of the most commonly used are valve-regulated lead-acid (VRLA) batteries. These batteries are sealed with polypropylene to prevent leaks and feature a valve that releases gas pressure from inside the battery. VRLA batteries are considered low-maintenance, provided that several key factors affecting their longevity are taken into account.
High temperature is one of the most common causes for premature battery failure. The higher the temperature, the faster the chemical reactions inside the battery occur, leading to increased water loss and corrosion. Lead-acid batteries, for example, are rated for optimal performance at 20–25°C. Statistics show that for every 10°C constant increase above the recommended temperature, battery life is reduced by 50%. Short-term fluctuations in temperature have a minimal effect.
When a UPS switches to battery power during a power outage, it discharges the battery. Once the power returns, the battery recharges—this is known as a discharge cycle. Each battery is designed with a limited number of discharge and recharge cycles. Each cycle slightly reduces battery capacity, depending on the depth of discharge. Batteries that are only partially discharged last longer than those that are fully discharged each time.
Proper storage of batteries before installation and use is essential. Storage areas should be climate-controlled and well-ventilated to keep batteries cool and dry. Even when unused, batteries begin to self-discharge over time, gradually losing capacity. If storage guidelines are not followed, the battery’s overall performance and service life can be significantly reduced.
Proper battery maintenance is vital to the reliability of any UPS system. Gradual battery degradation can be detected and managed through voltage checks, load testing and monitoring and inspections. Preventive maintenance extends battery life by detecting loose connections, removing corrosion, and identifying failing batteries before they affect the whole battery string.
With regular maintenance, the end of service life can be predicted accurately, and battery replacement can be planned without risking backup power loss.
If you’re looking for reliable UPS batteries, our experts are here to help! Contact us today, and our specialists in uninterruptible power solutions will recommend the best battery options based on your specific needs
Explore our Batteries section for more information.
