The effect of various buffer battery maintenance regimes on the state of health of VRLA batteries

  • Piotr Andrzej Ryś Warsaw University of Technology
  • Jacek Lipkowski Warsaw University of Technology
  • Maciej Siekierski Warsaw University of Technology
  • Piotr Biczel Warsaw University of Technology


Modern society relies on the constant flow of quality electricity. Various safety measures in the form of uninterruptible powersupplies (UPS) combined with diesel generation systems are used to ensure permanent power delivery to strategic servicesduring a power outage. Batteries UPS systems are held in buffer mode to avoid the self discharge process progressing. Theimpact of various buffer battery maintenance regimes is an important factor in ensuring the reliability of UPS systems. Aseries of tests on five battery pairs were performed to estimate the impact of five different buffer regimes on the batteries’state of health. The tests were carried out in the span of one year, at heightened temperature to accelerate the negativeimpact of the said regimes on the batteries’ state of health. The test results showed that, contrary to widely-accepted belief,rippling of the buffer charging current does not have a significant negative impact on battery health. A comparison did indeedshow that rippled charging current delivered lower total capacity loss than unrippled current. Then desulfation was appliedto the batteries after testing to estimate the amount of capacity that was lost due to sulfation. It determined that ripplingpromotes more irreversible capacity loss (not caused by sulfation) than unrippled current with the same average voltage. Theinsights gained from these tests could inform attempts by industry to slow down the deterioration of lead-acid batteries in UPSapplications.

Author Biographies

Piotr Andrzej Ryś, Warsaw University of Technology
Faculty of Chemistry, Department of Inogranic Chemistry
Jacek Lipkowski, Warsaw University of Technology
Faculty of Chemistry, Department of Inogranic Chemistry
Maciej Siekierski, Warsaw University of Technology
Faculty of Chemistry, Department of Inogranic Chemistry, PhD
Piotr Biczel, Warsaw University of Technology
Faculty of Electrical Engineering, PhD


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How to Cite
RYŚ, Piotr Andrzej et al. The effect of various buffer battery maintenance regimes on the state of health of VRLA batteries. Journal of Power Technologies, [S.l.], v. 98, n. 4, p. 365–376, jan. 2019. ISSN 2083-4195. Available at: <>. Date accessed: 14 july 2024.
Energy Conversion and Storage


Batteries; Lead-Acid; VRLA; State of Health; Buffering charge; Desulphation

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