BATTERY fold by pulling straight up at the ends (Figure 10). After testing cells, reinstall manifold by placing it in position and pushing it down firmly until seated. Figure 10 - Removing Vent Manifold to Gain Access to Cells (Side Terminal Maintenance Free Battery) Top Terminal Batteries: Use a knife blade to cut through the top plaque center section on the dotted lines (Figure 11). After removal of the section of the plaque, individual caps can be unscrewed to allow access to each cell. When reinstalling cell caps after testing, make sure caps are properly seated. Figure 11 - Removing Section of Top Plaque to Gain Access to Cell Caps (Top Terminal Maintenance Free Battery) c. If electrolyte level is above the plates in all cells, proceed to Step 2. d. If electrolyte level is below the tops of the plates in one or more cells, add distilled water until electrolyte level is just above the tops of the separators.  Charge the battery 15 minutes at 15-25 amperes to mix the water with the elec- trolyte.  After charging, proceed to Step 2. STEP 2.  STATE OF CHARGE TEST The battery’s state of charge can be determined by either the specific gravity (hydrometer) test or by the stabilized open circuit voltage test. Specific Gravity (Hydrometer) Test Perform specific gravity (hydrometer) test on all cells (Figure 12a).  (Refer to instructions for reading hydrometer under ELECTROLYTE AND SPECIFIC GRAVITY.) a. Measure and record specific gravity, corrected to 26.7°C (80°F), of each cell.  Compare readings obtained with Table 4a to determine battery's state of charge. b. If specific gravity readings are 1.225 or higher and are within 50 points (.050 specific gravity) between, highest and lowest cells, proceed to Step 3. TABLE 4a Specific Gravity (Corrected to State of Charge 26.7°C or 80°F) 1.265 Fully Charged 1.225 75% Charged 1.190 50% Charged 1.155 25% Charged 1.120 Discharged c. If specific gravity readings are low (below 1.225) or vary more than 50 points between highest and lowest cells, recharge battery as instructed under CHARGING and inspect vehicle’s electrical system to determine cause for low state of charge. d. If, after charging, specific gravity readings are within 50 points between highest and lowest cells, proceed to Step 3.  If readings still vary more than 50 points after charging, replace the battery. CTS-4111B - Page 10