Yamaha WR450FB 2012 Owner's Service Manual page 368

ECA13660
••.---~~~~~~~~-
• This is a VRLA (Valve Regulated Lead Ac-
id) battery. Never remove the sealing caps
because the balance between cells will not
be maintained and battery performance
will
deteriorate.
• Charging time, charging amperage and
charging voltage for a VRLA (Valve Regu-
lated Lead Acid) battery are different from
those of conventional batteries. The VRLA
(Valve Regulated Lead Acid) battery
should be charged according to the appro-
priate charging method. If the battery is
overcharged, the electrolyte level will drop
considerably. Therefore, take special care
when charging the battery.
TIP _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
Since VALA (Valve Regulated Lead Acid) bat-
teries are sealed, it is not possible to check the
charge state of the battery by measuring the
specific gravity of the electrolyte. Therefore, the
charge of the battery has to be checked by
measuring the voltage at the battery terminals.
1. Remove:
• Side cover {left/right)
•Seat
Refer to "GENERAL CHASSIS" on page 4-
1.
2. Disconnect:
• Battery leads
(from the battery terminals)
ECA13640
ti9"D~~~~~~~~~-
First, disconnect the negative battery lead
"1 ", and then positive battery lead "2".
ELECTRICAL COMPONENTS
TTTTTTTTTTTTTTTTTTTTTTTTTTTTTTTT
a. Connect a pocket tester to the battery termi-
nals.
• Positive tester probe
~
positive battery terminal
• Negative tester probe
~
negative battery terminal
TIP_·--------~--­
•The charge state of a VALA (Valve Regulated
Lead Acid) battery can be checked by mea-
suring its open-circuit voltage (i.e., the voltage
when the positive battery terminal is discon-
nected).
• No charging is necessary when the open-cir-
cuit voltage equals or exceeds
12.8
V.
b. Check.the charge of the battery, as shown in
the charts and the following example.
9-67
Example
Open-circuit voltage
=
12.0 V
Charging time
=
6.5 hours
Charge of the battery
= 20-~0°/o
A
13.0
12.5
11.5
D
A. Open-circuit voltage (V)
B. Charging time (hours)
B
C. Relationship between the open-circuit voltage
and the charging time at 20°c (68°F)
D. These values vary with the temperature, the
condition of the battery plates, and the electro-
lyte level.
A
14
131----..__~-.....z,,-----+--+---1
I
I
10
-----if-----t----r~--=--,
- t
I
c
.__ ___
~___..
________ , _.....___ B
100 75 50 30 25 20 0
A. Open-circuit voltage (V)
B. Qharging condition of the battery(%)
C. Ambient temperature 20°C (68°F)
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