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Most UPS batteries should last three to five years. There are many factors which affect Battery life including environment and number of discharges. Below are some guidelines to ensure optimum life expectancy:

1. Operating Temperature: The optimum operating temperature for a lead-acid UPS battery is 20-25° C (68-77° F). Elevated temperature reduces longevity. As a guideline, every 8° C (15° F) rise in temperature will cut the UPS battery life in half. A UPS battery which would last for 4 years at 25° C (77° F), will only be good for 2 years if operated at 33° C (95° F). Keep in mind that the battery temperature inside your UPS will always be warmer than the ambient temperature of the location where the UPS is installed.

2. Battery Calibration and Deep Discharge: Only perform runtime calibrations on your UPS one or two times a year, if necessary. Some of our customers want to check their systems to verify that their runtime is sufficient. However, consistently performing these calibrations can significantly decrease the life expectancy of your UPS battery.  It is also important to remember that a UPS is not designed for constant deep discharges. We do not recommend using your UPS as a portable power supply that is repeatedly discharged/recharged (like on a portable equipment cart). These units are designed for emergency use during unexpected power outages or momentary loss of power.

3. Storage: Do not store UPS batteries for extended periods of time. New UPS batteries or UPS units should be stored for no more than 6 months from date of purchase, as they ship from the factory at approximately 80-90% charge. After this period, the UPS battery should be used or it will lose a great deal of its charge . It is not advisable to store UPS batteries that have already been in use. Extended storage without periodic charging can result in shortened life expectancy and erratic battery performance.

Temperature also plays a large part in battery degradation during storage:

  • If the ambient temperature during storage is – 15°C to + 30°C (+ 5°F to + 86°F), perform a full recharge cycle at least every six months.
  • In environments where the ambient temperature is + 30°C to + 45°C (+ 86°F to + 113°F), perform a full recharge cycle at least every three months.

4.  Load: As the load increases on your UPS, the runtime decreases. It is not recommended that the load exceed 80 percent of the UPS unit’s rated capacity. In the event of a power failure, a UPS loaded to full capacity will discharge the battery very quickly and there is a potential that the life expectancy of the UPS battery will be significantly reduced.

5. Battery chemical reaction: As the VRLA (AGM) battery ages, a chemical reaction called “sulfation”.
This leads to:

  • longer charging time than normal
  • excessive heat build-up leading to “boil out”
  • shorter running times between charges
  • dramatically shorter battery life

6. Battery replacement: since VRLA UPS batteries end of life is five (5) years, it is always advisable to replace the UPS battery not longer than five (5) years to prevent the risk of possible hydrogen sulfide gas emission.

Get in touch

For advice about what the best battery for your system is or to enquiry about our battery replacement service, get in touch with our team today with your requirements and we will be happy to help.

Battery Replacement Service

Our engineers can carry out on site UPS battery replacements for all makes and models of uninterruptible power supply during normal office hours, or out of hours with minimal fuss or interruption to your business. Replacement UPS batteries can also be replaced during a maintenance visit or as part of a UPS health check.

Old UPS batteries must be disposed of safely and in accordance with special waste regulations. At Source UPS, we can collect your old UPS batteries for certified disposal and offer a battery removal service for larger UPS systems.

To get a quotation for replacement UPS Batteries or to speak to a member of our team please give us a call on 01252 692559 or email:

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