Infiniti F50. Manual - part 739

PREPARATION

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PREPARATION

PFP:00002

Special Service Tool

EKS0014A

Tool number
Tool name

Description

J-44373 Model 620
Battery/Starting/Charging 
system tester

SEL403X

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BATTERY

BATTERY 

PFP:00011

How to Handle Battery 

EKS000A2

CAUTION:

●

If it becomes necessary to start the engine with a booster battery and jumper cables, use a 12-volt
booster battery.

●

After connecting battery cables, ensure that they are tightly clamped to battery terminals for good
contact.

●

Never add distilled water through the hole used to check specific gravity.

METHODS OF PREVENTING OVER-DISCHARGE 

The following precautions must be taken to prevent over-discharging a battery.

●

The battery surface (particularly its top) should always be kept
clean and dry.

●

The terminal connections should be clean and tight.

●

At every routine maintenance, check the electrolyte level.
This also applies to batteries designated as “low maintenance”
and “maintenance-free”.

●

When the vehicle is not going to be used over a long period of
time, disconnect the negative battery terminal. (If the vehicle has
an extended storage switch, turn it off.)

●

Check the charge condition of the battery.
Periodically check the specific gravity of the electrolyte. Keep a
close check on charge condition to prevent over-discharge.

CHECKING ELECTROLYTE LEVEL

WARNING:

Do not allow battery fluid to come in contact with skin, eyes, fabrics, or painted surfaces. After touch-
ing a battery, do not touch or rub your eyes until you have thoroughly washed your hands. If acid con-
tacts eyes, skin or clothing, immediately flush with water for 15 minutes and seek medical attention.

MEL040F

MEL041F

MEL042F

BATTERY

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Remove the cell plug using a suitable tool.

●

Add distilled water up to the MAX level.

Sulphation

A battery will be completely discharged if it is left unattended
for a long time and the specific gravity will become less than
1.100. This may result in sulphation on the cell plates.
To determine if a battery has been “sulphated”, note its voltage
and current when charging it. As shown in the figure, less cur-
rent and higher voltage are observed in the initial stage of
charging sulphated batteries.
A sulphated battery may sometimes be brought back into ser-
vice by means of a long, slow charge, 12 hours or more, fol-
lowed by a battery capacity test.

SPECIFIC GRAVITY CHECK

1.

Read hydrometer and thermometer indications at eye level.

2.

Use the chart below to correct your hydrometer reading accord-
ing to electrolyte temperature.

Hydrometer Temperature Correction

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PKIA2353E

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Battery electrolyte temperature 

°

C (

°

F)

Add to specific gravity reading

71 (160)

0.032

66 (150)

0.028

60 (140)

0.024

54 (130)

0.020

49 (120)

0.016

43 (110)

0.012

38 (100)

0.008

32 (90)

0.004

27 (80)

0

21 (70)

−

0.004

16 (60)

−

0.008

10 (50)

−

0.012

4 (40)

−

0.016

−

1 (30)

−

0.020

−

7 (20)

−

0.024

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BATTERY

CHARGING THE BATTERY

CAUTION:

●

Do not “quick charge” a fully discharged battery.

●

Keep the battery away from open flame while it is being charged.

●

When connecting the charger, connect the leads first, then turn on the charger. Do not turn on the
charger first, as this may cause a spark.

●

If battery electrolyte temperature rises above 55

°

C (131

°

F), stop charging. Always charge battery

at a temperature below 55

°

C (131

°

F).

Charging Rates

Do not charge at more than 50 ampere rate.

NOTE:
The ammeter reading on your battery charger will automatically decrease as the battery charges. This indi-
cates that the voltage of the battery is increasing normally as the state of charge improves. The charging amps
indicated above refer to initial charge rate.

●

If, after charging, the specific gravity of any two cells varies more than 0.050, the battery should be
replaced.

Trouble Diagnosis with Battery/Starting/Charging System Tester

EKS000SF

CAUTION:

When working with batteries, always wear appropriate eye protection.

NOTE:

●

To ensure a complete and thorough diagnosis, the battery, starter and alternator test segments must be
done as a set from start to finish.

●

If battery surface charge is detected while testing, the tester will prompt you to turn on the headlamps to
remove the surface charge.

●

If necessary, the tester will prompt you to determine if the battery temperature is above or below 0

°

C

(32

°

F). Choose the appropriate selection by pressing the up or down arrow button, then press “ENTER” to

make the selection.

−

12 (10)

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0.028

−

18 (0)

−

0.032

Corrected specific gravity

Approximate charge condition

1.260 - 1.280

Fully charged

1.230 - 1.250

3/4 charged

1.200 - 1.220

1/2 charged

1.170 - 1.190

1/4 charged

1.140 - 1.160

Almost discharged

1.110 - 1.130

Completely discharged

Battery electrolyte temperature 

°

C (

°

F)

Add to specific gravity reading

Amps

Time

50

1 hour

25

2 hours

10

5 hours

5

10 hours