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Example: Within 90 days of installation, measure a sample of
20 new batteries (12V, 17Ah) that average 300S each when fully
charged. Conductance will decline as a battery ages. The amount
of acceptable loss will depend on the type of application for which
the battery is used. As a general rule:
<30% loss = Strong battery - no significant capacity loss (300 x 0.70
or more ≥210S)
30 to 40% loss = Marginal battery - nearing the end of its
serviceable life (180 to 210S)
>40% loss = Degraded battery - may not meet the required load
(300 x 0.60 or less ≤180S)
Consult your battery supplier to ensure that the rated battery
capacity is sufficient for the applicable equipment runtime while
allowing for the appropriate aging factor of the batteries.
Battery temperature compensation scales
Battery temperature
35°C (95°F) or warmer
30°C (86°F)
25°C (77°F)
20°C (68°F)
15°C (59°F)
10°C (50°F)
5°C (41°F)
0°C (32°F) or colder
Examples:
Using a reference value of 300, the GS Yuasa GYT117 reports 63%,
190S. If the battery temperature is 35°C (0.63 x 0.93 = 0.59 or 59%),
the battery should be replaced.
Again using a reference value of 300, the GS Yuasa GYT117 reports
63%, 190S. If the battery temperature is 0°C (0.63 x 1.175 = 0.74 or
74%), the battery is good.
For a full list of Siemens values for Yuasa battery types visit
www.yuasa.com/GYT117
7
Multiply GS Yuasa
%Ref. value by
0.930
0.965
1.000
1.035
1.070
1.105
1.140
1.175
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