Figure 12a - Testing Specific Gravity

Figure 10 - Removing Vent Manifold to Gain Access to Cells

TM-5-3820-256-24-4 Drilling System Well Rotary Truck Mounted Air Transportable 600 Feet Capacity Model LP-12 NSN 3820-01-246-4276 Manual
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TM 5-3820-236-24-4 BATTERY MT-23248 Figure 12a - Testing Specific Gravity Stabilized Open Circuit Voltage Test a. If the battery has just been recharged or has been in vehicle service, the surface charge must be removed before an accurate voltage measurement can be made. To remove surface charge, crank engine for 15 seconds. DO NOT allow engine to start. To prevent engine starting: Gasoline Engine: Disconnect coil high tension lead from distributor cap. Ground lead to engine. Diesel Engine: Apply engine stop control or dis- connect fuel solenoid valve lead as required to prevent engine start. After cranking engine, allow battery to rest for 15 minutes. b. Connect voltmeter across battery terminals (Fig- ure 12b) and observe reading. Compare reading obtained with Table 4b to determine battery’s state of charge. c. If stabilized voltage is above 12.4 volts, proceed to Step 3. MT-26010 Figure 12b - Voltmeter Connection for Stabilized Open Circuit Voltage Test TABLE 4b Stabilized Open Circuit Voltage State of Charge 12.6 V or More Fully Charged 12.4 V 75% Charged 12.2 V 50% Charged 12.0 V 25% Charged 11.7 V or Less Discharged d. If stabilized voltage is below 12.4 volts, recharge battery as instructed under CHARGING and inspect vehicle’s electrical system to determine cause for low state of charge. After charging battery, proceed to Step 3. Figure 12c - Relationship of Stabilized Open Circuit Voltage to State of Charge CTS-4111B -Page 11

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