Checking And Charging The Battery
Fragment manuala — str. 689–691
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ELECTRICAL COMPONENTS
EWA13310
• Charging time, charging amperage and
WARNING charging voltage for an MF battery are dif-
Never use a fuse with an amperage rating ferent from those of conventional batteries.
other than that specified. Improvising or us- The MF battery should be charged accord-
ing a fuse with the wrong amperage rating ing to the appropriate charging method. If
may cause extensive damage to the electri- the battery is overcharged, the electrolyte
cal system, cause the lighting and ignition level will drop considerably. Therefore,
systems to malfunction and could possibly take special care when charging the bat-
cause a fire. tery.
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4. Install: Since MF batteries are sealed, it is not possible
• Front cowling right inner panel 1 to check the charge state of the battery by mea-
Refer to “GENERAL CHASSIS” on page 4-1. suring the specific gravity of the electrolyte.
EAS28030
Therefore, the charge of the battery has to be
CHECKING AND CHARGING THE BATTERY checked by measuring the voltage at the battery
EWA13290 terminals.
WARNING
1. Remove:
Batteries generate explosive hydrogen gas • Front cowling right inner panel 1
and contain electrolyte which is made of poi- Refer to “GENERAL CHASSIS” on page 4-1.
sonous and highly caustic sulfuric acid. 2. Disconnect:
Therefore, always follow these preventive • Battery leads
measures: (from the battery terminals)
• Wear protective eye gear when handling or ECA13640
working near batteries. CAUTION:
• Charge batteries in a well-ventilated area. First, disconnect the negative battery lead
• Keep batteries away from fire, sparks or “1”, and then positive battery lead “2”.
open flames (e.g., welding equipment,
lighted cigarettes).
• DO NOT SMOKE when charging or han-
dling batteries.
• KEEP BATTERIES AND ELECTROLYTE
OUT OF REACH OF CHILDREN.
• Avoid bodily contact with electrolyte as it
can cause severe burns or permanent eye 2
injury. 1
FIRST AID IN CASE OF BODILY CONTACT:
EXTERNAL 3. Remove:
• Skin — Wash with water. • Battery
• Eyes — Flush with water for 15 minutes and 4. Check:
get immediate medical attention. • Battery charge
INTERNAL ▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
• Drink large quantities of water or milk fol- a. Connect a pocket tester to the battery termi-
lowed with milk of magnesia, beaten egg or nals.
vegetable oil. Get immediate medical atten- • Positive tester probe →
tion. positive battery terminal
EC3P61004 • Negative tester probe →
CAUTION: negative battery terminal
• This is a sealed battery. Never remove the
sealing caps because the balance between
cells will not be maintained and battery per-
formance will deteriorate.
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ELECTRICAL COMPONENTS
ECA13670
NOTE:
CAUTION:
• The charge state of an MF battery can be
• Never remove the MF battery sealing caps.
checked by measuring its open-circuit voltage
• Do not use a high-rate battery charger
(i.e., the voltage when the positive battery ter-
since it forces a high-amperage current
minal is disconnected).
into the battery quickly and can cause bat-
• No charging is necessary when the open-cir-
tery overheating and battery plate damage.
cuit voltage equals or exceeds 12.8 V.
• If it is impossible to regulate the charging
b. Check the charge of the battery, as shown in current on the battery charger, be careful
the charts and the following example. not to overcharge the battery.
Example • When charging a battery, be sure to remove
Open-circuit voltage = 12.0 V it from the vehicle. (If charging has to be
Charging time = 6.5 hours done with the battery mounted on the vehi-
Charge of the battery = 20–30% cle, disconnect the negative battery lead
from the battery terminal.)
• To reduce the chance of sparks, do not
plug in the battery charger until the battery
charger leads are connected to the battery.
• Before removing the battery charger lead
clips from the battery terminals, be sure to
turn off the battery charger.
• Make sure the battery charger lead clips are
in full contact with the battery terminal and
that they are not shorted. A corroded bat-
A. Open-circuit voltage (V) tery charger lead clip may generate heat in
B. Charging time (hours) the contact area and a weak clip spring may
C. Relationship between the open-circuit voltage cause sparks.
and the charging time at 20 °C (68 °F) • If the battery becomes hot to the touch at
D. These values vary with the temperature, the any time during the charging process, dis-
condition of the battery plates, and the connect the battery charger and let the bat-
electrolyte level. tery cool before reconnecting it. Hot
batteries can explode!
• As shown in the following illustration, the
open-circuit voltage of an MF battery stabi-
lizes about 30 minutes after charging has
been completed. Therefore, wait 30 min-
utes after charging is completed before
measuring the open-circuit voltage.
A. Open-circuit voltage (V)
B. Charging condition of the battery (%)
C. Ambient temperature 20 °C (68 °F)
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5. Charge:
• Battery
(refer to the appropriate charging method) A. Open-circuit voltage (V)
EWA13300
WARNING B. Time (minutes)
C. Charging
Do not quick charge a battery.
D. Ambient temperature 20 °C (68 °F)
E. Check the open-circuit voltage.
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ELECTRICAL COMPONENTS
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Charging method using a variable-current
Voltage should be measured 30 minutes after
(voltage) charger
the engine is stopped.
a. Measure the open-circuit voltage prior to
charging. b. Connect a charger and ammeter to the bat-
NOTE: tery and start charging.
Voltage should be measured 30 minutes after c. Make sure that the current is higher than the
the engine is stopped. standard charging current written on the bat-
tery.
b. Connect a charger and ammeter to the bat- NOTE:
tery and start charging.
If the current is lower than the standard charging
NOTE:
current written on the battery, this type of battery
Set the charging voltage at 16–17 V. If the set- charger cannot charge the MF battery. A vari-
ting is lower, charging will be insufficient. If too able voltage charger is recommended.
high, the battery will be over-charged.
d. Charge the battery until the battery’s charg-
c. Make sure that the current is higher than the ing voltage is 15 V.
standard charging current written on the bat- NOTE:
tery.
Set the charging time at 20 hours (maximum).
NOTE:
If the current is lower than the standard charging e. Measure the battery open-circuit voltage after
current written on the battery, set the charging leaving the battery unused for more than 30
voltage adjust dial at 20–24 V and monitor the minutes.
amperage for 3–5 minutes to check the battery. 12.8 V or more --- Charging is complete.
12.7 V or less --- Recharging is required.
• Standard charging current is reached Under 12.0 V --- Replace the battery.
Battery is good.
• Standard charging current is not reached ▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲▲
Replace the battery. 6. Install:
• Battery
d. Adjust the voltage so that the current is at the
7. Connect:
standard charging level.
• Battery leads
e. Set the time according to the charging time
(to the battery terminals)
suitable for the open-circuit voltage. ECA13630
f. If charging requires more than 5 hours, it is CAUTION:
advisable to check the charging current after First, connect the positive battery lead “1”,
a lapse of 5 hours. If there is any change in and then the negative battery lead “2”.
the amperage, readjust the voltage to obtain
the standard charging current.
g. Measure the battery open-circuit voltage after
leaving the battery unused for more than 30
minutes.
12.8 V or more --- Charging is complete.
12.7 V or less --- Recharging is required.
Under 12.0 V --- Replace the battery. 1
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Charging method using a constant volt- • Battery terminals
age charger Dirt → Clean with a wire brush.
a. Measure the open-circuit voltage prior to Loose connection → Connect properly.
charging. 9. Lubricate:
• Battery terminals
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