Battery Tips
C–9
Battery Connections Connections to battery posts must be made with
permanent connectors that provide a reliable, low-resistance connection.
Do not use alligator clips. Clean the connections regularly and prevent
corrosion by using a protective spray coating or vaseline.
Battery State of Charge You can measure battery state of charge with
a hydrometer or, more easily, with a voltmeter. Use a digital voltmeter
than can display tenths or hundredths of a volt when measuring 10 to 30
volts. Make your measurements when the battery has not been charged or
discharged for several hours. For a deep-cycle battery at 77º F (25º C), use
the following table:
Battery Voltage State of Charge
12.7–13.0 100%
12.5–12.6 80%
12.3–12.4 60%
12.1–12.2 40%
11.9–12.0 20%
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