INTERPRETING TEST RESULTS
AVTM246004 BITE 2/2P Rev 4 July 2011
65
NOTE: Please note the placements of HVAC systems as they can
have a significant effect on the temperatures of the cells in the
battery. For example, cell on the top tier of a three-tier rack may
have higher temperatures than the cells on the bottom tier.
NOTE: Middle cells in three-cell or four-cell trays of Valve-
regulated, lead-acid batteries may have a higher temperature due
to the inability to remove heat as well as the outside cells.
A suggested correction factor for impedance values of flooded
lead-acid cells is shown below:
Z
b
@ 77 ° F = 0.088 (Z
m
)
(T + 30)
-0.520
Z
b
= corrected battery impedance to 77 ° F
Z
m
= measured impedance value
T = measured temperature value in °F
Contact Megger at
610-676-8500.
Valve-regulated, lead-acid cells may differ among battery
vendors and electrolyte types. Gel style cells have a different
temperature response curve than the starved-electrolyte
(AGM) types. If temperature correction is required, contact the
battery manufacturer for these data.
www.GlobalTestSupply.com
Find Quality Products Online at: sales@GlobalTestSupply.com
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