10
sure the electrolyte covers the plates. If this isn’t the case, add distilled water until all
the plates are submerged. It is important not to over fill because the level will rise during
the charge process.
3. Check for correct polarity. Attaching the positive and negative voltmeter lead to the
positive and negative battery terminal should give a positive voltage reading. If it is
negative, a reverse polarity condition exists and you should contact your dealer or Rolls
Battery Technical Support.
4. Place batteries on charge. Please see Table 2 – charge parameters for required
charging settings. Do not let the cell temperature exceed 125°F (51.8°C). If the
temperature becomes excessive or the cells begin to gas vigorously, reduce the rate
of charge. Continue charging until all cells reach the specific gravity of the filling acid.
All cell voltages should be even (1.265 - 1.275).
5. See Initial Charge below.
iNiTiAL CHARgE
A battery may not be fully charged when received. The first charge brings the
battery to an operational state. Before this charging process, the cell electrolyte
level should be checked. Please ensure the electrolyte (liquid) covers the plates.
If this isn’t the case, add distilled water until all the plates are just submerged.
It is important not to over fill because the level will rise during the charging process.
Charge voltages are indicated in Table 2.
The electrolyte’s specific gravity is the most accurate measurement and it is
recommended to verify its value to determine if the cells are, in fact, fully charged.
The specific gravity should be constant for 3 hours for an accurate full charge
reading. Check the state of charge as related to specific gravity. Initial charging
may take 10 hours. Once the battery is fully charged, verify the electrolyte level
in the cell once more. The fluid should be 1/4 – 1/2 inch below the vent tube on
each cell as shown in Figure 7. Carefully add distilled water to adjust the level
if needed.
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