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Maintenance
Procedure
1. Open the vent caps and look inside the fill wells. Check electrolyte
level; the minimum level is at the top.
2. If there is no electrolyte visible, add just enough distilled/deionized
water to cover the plates.
3. Replace and tighten all water vent caps.
4. Put batteries on a complete charge before adding any additional
water (refer to the Charging section).
5. Once charging is completed, remove the vent caps and check the
electrolyte level.
6. Add water until the electrolyte level is 1/8” below the bottom of
the fill well.
7. Clean, replace, and tighten all vent caps.
State of Charge as related to Specific Gravity
and Open Circuit Voltage
Percent of Charge Specific Gravity (g/cm³)
corrected to 25°C
Open Circuit Voltage
6V 8V
100% 1.28 6.37 8.49
90% 1.26 6.31 8.41
80% 1.24 6.25 8.33
70% 1.22 6.19 8.25
60% 1.20 6.12 8.16
50% 1.18 6.05 8.07
40% 1.15 5.98 7.97
30% 1.13 5.91 7.97
20% 1.10 5.83 7.77
10% 1.07 5.75 7.67
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