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

Piotr Andrzej Ryś, Jacek Lipkowski, Maciej Siekierski, Piotr Biczel


Modern society relies on the constant flow of quality electricity. Various safety measures in the form of uninterruptible power
supplies (UPS) combined with diesel generation systems are used to ensure permanent power delivery to strategic services
during a power outage. Batteries UPS systems are held in buffer mode to avoid the self discharge process progressing. The
impact of various buffer battery maintenance regimes is an important factor in ensuring the reliability of UPS systems. A
series 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 negative
impact 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 indeed
show that rippled charging current delivered lower total capacity loss than unrippled current. Then desulfation was applied
to the batteries after testing to estimate the amount of capacity that was lost due to sulfation. It determined that rippling
promotes more irreversible capacity loss (not caused by sulfation) than unrippled current with the same average voltage. The
insights gained from these tests could inform attempts by industry to slow down the deterioration of lead-acid batteries in UPS


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

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C. Smith, Storage Batteries. Third Edition, Pitman Publishing Limited,

London, 1980.

D. Linden, B. Reddy, T, Handbook of Batteries. Third Edition, McGraw-

Hill Professional, New York, 2002.

G. Karlsson, Simple model for the overcharge reaction in valve regulated

lead/acid batteries under fully stationary conditions, Journal of

power sources 58 (1) (1996) 79–85.

M. A. Karimi, H. Karami, M. Mahdipour, Ann modeling of water consumption

in the lead-acid batteries, Journal of Power Sources 172 (2)

(2007) 946–956.

S. Bai, S. Lukic, A 12-pulse diode rectifier with energy storage integration

and high power quality on both ac and dc side, in: Energy Conversion

Congress and Exposition (ECCE), 2012 IEEE, IEEE, 2012, pp.


Materials from

Y. B. Blauth, I. Barbi, A phase-controlled 12-pulse rectifier with unity

displacement factor without phase shifting transformer, in: Applied

Power Electronics Conference and Exposition, 1998. APEC’98. Conference

Proceedings 1998., Thirteenth Annual, Vol. 2, IEEE, 1998, pp.


A. Ruddell, A. Dutton, H.Wenzl, C. Ropeter, D. Sauer, J. Merten, C. Orfanogiannis,

J. Twidell, P. Vezin, Analysis of battery current microcycles

in autonomous renewable energy systems, Journal of Power sources

(2) (2002) 531–546.

C. Protogeropoulos, J. Nikoletatos, “EXAMINATION OF RIPPLE CURRENT



SLI BATTERIES”, 14th EC Photovoltaic Solar Energy Conference,

Barcelona, Spain, 1997.

R. F. Nelson, M. A. Kepros, Ac ripple effects on vrla batteries in float

applications, in: Battery Conference on Applications and Advances,

The Fourteenth Annual, IEEE, 1999, pp. 281–289.

P. T. Moseley, J. Garche, Electrochemical energy storage for renewable

sources and grid balancing, Newnes, 2014.

D. U. Sauer, H. Wenzl, Comparison of different approaches for lifetime

prediction of electrochemical systems—using lead-acid batteries

as example, Journal of Power sources 176 (2) (2008) 534–546.

L. Lam, N. Haigh, C. Phyland, A. Urban, Failure mode of valveregulated

lead-acid batteries under high-rate partial-state-of-charge

operation, Journal of Power Sources 133 (1) (2004) 126–134.

B. Zhang, J. Zhong, W. Li, Z. Dai, Z. Cheng, Transformation of inert

pbso4 deposit on the negative electrode of a lead-acid battery into its

active state, Journal of Power Sources 195 (13) (2010) 4338–4343.

D. Pavlov, G. Petkova, T. Rogachev, Influence of h2so4 concentration

on the performance of lead-acid battery negative plates, Journal of

Power Sources 175 (1) (2008) 586–594.

L. Lam, H. Ceylan, N. Haigh, T. Lwin, D. Rand, Influence of residual

elements in lead on oxygen-and hydrogen-gassing rates of lead-acid

batteries, Journal of Power Sources 195 (14) (2010) 4494–4512.

L. Lam, O. Lim, N. Haigh, D. Rand, J. Manders, D. Rice, Oxide for

valve-regulated lead–acid batteries, Journal of power sources 73 (1)

(1998) 36–46.

M. Saravanan, S. Ambalavanan, Failure analysis of cast-on-strap in

lead-acid battery subjected to vibration, Engineering Failure Analysis

(8) (2011) 2240–2249.

T. Khun, The Electrochemistry of Lead, Academic Press, London,

D. U. Sauer, E. Karden, B. Fricke, H. Blanke, M. Thele, O. Bohlen,

J. Schiffer, J. B. Gerschler, R. Kaiser, Charging performance of automotive

batteries—an underestimated factor influencing lifetime and

reliable battery operation, Journal of power sources 168 (1) (2007)


M. Thele, J. Schiffer, E. Karden, E. Surewaard, D. Sauer, Modeling

of the charge acceptance of lead–acid batteries, Journal of Power

Sources 168 (1) (2007) 31–39.


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