Chapter 29, 12-volt and HV Battery Service

What two parts must a hybrid vehicle have for it to be conventionally jump started without component damage?

12-volt battery and 12-volt starting motor.

HV battery service life averages about ____________.

150,000 miles

If a battery is rated at 90 amp-hours, what amperage should be used for a load test?

270 amps

During a load test, if the 12V battery reads __________ volts or more, the battery is good.

9.5

What should you use to keep battery terminals from corroding?

A conductive, dielectric compound or white grease.

A hydrometer test indicates a battery's electrolyte has a specific gravity of 1.269 at 90 degrees Fahrenheit. Technician A says the battery is fully charged. Technician B says the battery may be defective or in need of recharging. Who is right?

A only

What five steps are done during battery maintenance?

A. Inspecting the battery case, battery terminals, battery hold-down, and fasteners on the battery cable ends for corrosion and damage. B. Removing and cleaning the battery terminal connections. C. Washing off the top of the battery case with soap or baking soda and water to neutralize any acid or remove dirt buildup. D. Repairing the battery tray, if rusted or broken. E. Inspecting the electrolyte level. Most new low-current, 12-volt batteries for hybrids have removable vent caps for service.

Technician A says that water should be poured over a damaged lithium-ion HV battery if it is smoking. Technician B says that after removing an HV battery, the battery should be sent to a specialty shop or be refurbished or recycled. Who is right?

B only

Technician A says the invisible hydrogen gas is not flammable. Technician B says that batteries can explode. Who is right?

B only

Technician A says you should use a metal funnel when pouring electrolyte into a dry-charged battery. Technician B says you should use a plastic funnel. Who is right?

B only

Technician A says you should wash the top of a battery with detergent solution. Technician B says you should wash the top of a battery with baking soda and water. Who is right?

B only

A(n) _______ tests the battery under full load conditions.

Battery load

List three values an HV battery control module monitors

Battery pack temperatures, Current input and output levels, and Discharge voltages.

Technician A says charging a frozen battery can cause the case to rupture and may cause an explosion. Technician B says a frozen battery will usually have plate and cell damage. Who is right?

Both A and B

Technician A says you should always wear safety glasses when carrying a battery. Technician B says you should use a battery strap or battery carrier to carry a battery. Who is right?

Both A and B

Technician A says you should wear eye protection when working around batteries. Technician B says even the film buildup on a battery can contain acid. Who is right?

Both A and B

What is a battery drain test?

Checks for an abnormal current draw (High parasitic load) with the ignition key off.

Many batteries are ranked in SAE _______, rather than amp-hours.

Cold Cranking Amps (CCA)

All of the following are procedures to perform a battery terminal test, except:

Connect an ammeter to the appropriate cable ends.

How do you check battery state of charge with a voltmeter?

Connect the voltmeter across the battery terminals or posts and turn on the vehicle's headlights or blower motor to provide a small current load.

An HV battery load test drive measures ________ and __________ levels into and out of the large battery pack while driving or during simulated driving.

Current, Voltage

What is the first step in removing the HV battery from a vehicle?

Depower the electrical system according to the vehicle manufacturer's instructions.

Which of the following is the correct order for removing a battery?

Disconnect the cables, loosen the battery hold-down, use a battery strap to remove the battery.

If battery electrolyte is low, fill the cells to the correct level with ________.

Distilled Water

A battery __________ measures the specific gravity (and the state of charge) for battery electrolyte.

Hydrometer

What is a battery terminal test?

It quickly checks for a poor electrical connection (High voltage drop) between the battery cables and battery terminals on post-type batteries.

A discharged battery will have _________.

Lower specific gravity than a fully charged battery.

A battery drain test indicates a drain of .75 amps. Technician A says this an acceptable drain. Technician B says this is a normal parasitic drain caused by the clock and computer. Who is right?

Neither A nor B

Hybrid vehicle jump starting is being discussed. Technician A says that if a hybrid can be jump started, the jumper cables should be connected to the 12-volt battery positive-to-negative and positive-to-negative. Technician B says that connecting two HV batteries together with jumper cables is the safest way. Who is right?

Neither A nor B

Technician A says you can short jumper cables together and connect them backward. Technician B says by connecting the last negative jumper cable away from the battery, the battery gas will explode. Who is right?

Neither A nor B

When jump starting, connect the two batteries in order, ___________.

Positive to positive and negative to negative

All of the following criteria must be used when selecting a replacement battery, except:

Power rating must be less than factory recommendations.

What is a memory saver?

Provides power to the computer and also prevents the computer from having to relearn information, which could temporarily upset drivabiltiy.

A bad HV power cable connection can cause all of the following problems, except:

Shortened HV battery recharging times.

A battery charger is a(n) ________ and diode rectifier circuit that changes wall outlet voltage to slightly above battery voltage.

Step-down Transformer

A new dry-charged battery must be filled with _________ before installation.

Sulfuric Acid

What should happen if the specific gravity in any cell varies excessively from the other cells?

The battery should be replaced.

During load test, if the amp-hour rating is given, you should load the battery to ________ its rating.

Three times

What is the purpose of a cell voltage test?

To see if the battery is defective or just discharged.

To determine the load test for a battery rated in cold crank amps, divide the cold crank rating by __________.

Two

HV power cable resistance should be less than ______ per ________ of cable.

0.001 ohm, 10 feet.