BATTERY BATTERY State of ChargeState of Charge

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By By Vance Bloom Vance Bloom

ObjectiveObjectiveStudent will determine the “State of Charge” Student will determine the “State of Charge” of a battery using the “Voltage Method” and of a battery using the “Voltage Method” and document results. Student will also be aware document results. Student will also be aware

of two other methods of determining of two other methods of determining “ “State of Charge”.State of Charge”.

Remember, this test does not tell you if the battery Remember, this test does not tell you if the battery is good or bad, only how fully the battery is charged.is good or bad, only how fully the battery is charged.

Just How Much Power Just How Much Power is in That Battery?is in That Battery?

MATERIALS REQUIREDMATERIALS REQUIRED

1. EYE PROTECTION1. EYE PROTECTION2. VOLT-OHM-METER2. VOLT-OHM-METER3. BATTERY3. BATTERY

ProcedureProcedure

WEAR EYE PROTECTION!WEAR EYE PROTECTION!

Voltage MethodVoltage MethodDetermine battery voltageDetermine battery voltage

(Use 20 Volt DC Scale)(Use 20 Volt DC Scale)

Write It Down! Write It Down!

RESULTSRESULTS

Record Battery Voltage Measured &Record Battery Voltage Measured &Estimate % of Charge Using Chart BelowEstimate % of Charge Using Chart Below

Fill in voltage chart on skill sheetFill in voltage chart on skill sheet

11.8011.80 or Lower…………………0% Charge or Lower…………………0% Charge 12.0012.00 ………………………………….25% Charge ………………………………….25% Charge12.2012.20 ………………………………….50% Charge ………………………………….50% Charge12.4012.40 ………………………………….75% Charge ………………………………….75% Charge12.60 12.60 or Higher …………….100% Chargeor Higher …………….100% Charge

SPECIFIC GRAVITY METHODSPECIFIC GRAVITY METHOD(When applicable)(When applicable)

SPECIFIC GRAVITY REFERENCE CHART

Red 1.000 Water (dead)White 1.225White 1.225 Recharge RechargeGreen 1.250 - 1.300 Full ChargeGreen 1.250 - 1.300 Full Charge

IF READINGS VARY BY MORE THAN 0.050 REPLACE BATTERYIF READINGS VARY BY MORE THAN 0.050 REPLACE BATTERY

BATTERY EYE METHOD BATTERY EYE METHOD (When applicable)(When applicable)

Observe the color of the indicator (EYE)and record the result: __________Green orGreen or BlueBlue = 65-10065-100 percent charge. The battery is adequately charged for further testing.Dark or Black = 0-65 percent charge. The battery is NOT ADEQUATELY charged and must be charged.

Yellow,Yellow, Clear, or BrightBright COLOR = Battery must be replaced.

SPECIFIC GRAVITY METHODSPECIFIC GRAVITY METHOD(When the battery has removable caps)(When the battery has removable caps)

Specific Gravity Specific Gravity TesterTester

Red means “Dead”Red means “Dead”White means “Charge”White means “Charge”Green means “Full” Green means “Full”

SPECIFIC GRAVITY METHODSPECIFIC GRAVITY METHOD(When applicable)(When applicable)

Specific Gravity Specific Gravity TesterTester

DrawbacksDrawbacks1. Easily Broken (Glass)1. Easily Broken (Glass)

2. Messy, Gets Acid all over2. Messy, Gets Acid all over

3. Some Batteries do not have 3. Some Batteries do not have

access to acid (sealed caps)access to acid (sealed caps)

Recommendations?Recommendations?

Does the Battery need to be Charged?Does the Battery need to be Charged?How much charge was in it?How much charge was in it?

Does anything need to be done?Does anything need to be done?(Cleaning , Water Added, ETC…)(Cleaning , Water Added, ETC…)

Record Your RecommendationsRecord Your RecommendationsOn Your Skill Sheet! On Your Skill Sheet!

NOW, CLEAN UP! NOW, CLEAN UP!

CLEAN, SHUT OFF CLEAN, SHUT OFF & PUT AWAY & PUT AWAY

VOLT-OHM-METERVOLT-OHM-METER

FILL OUT YOUR FILL OUT YOUR SKILL SHEET COMPLETELYSKILL SHEET COMPLETELY

& GET IT SIGNED!& GET IT SIGNED!

THE END THE END