Yamaha YZ 2019 Series, Owner'S Service Manual, Page: 357 / 398

ELECTRICAL COMPONENTS
8-58
NOTICE
ECA13640
First, disconnect the negative battery lead
“1”, and then positive battery lead “2”.
3. Remove:
•
Battery
4. Check:
•
Battery charge
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a. Connect the digital circuit tester to the battery
terminals.
TIP
•
The charge state of a VRLA (Valve Regulated
Lead Acid) battery can be checked by measur-
ing 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.
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5. Charge:
•
Battery
(refer to the appropriate charging method)
WARNING
EWA19390
Do not quick charge a battery.
NOTICE
ECA24800
• Do not use a high-rate battery charger
since it forces a high-amperage current
into the battery quickly and can cause bat-
tery overheating and battery plate damage.
• If it is impossible to regulate the charging
current on the battery charger, be careful
not to overcharge the battery.
• When charging a battery, be sure to remove
it from the vehicle. (If charging has to be
done with the battery mounted on the vehi-
cle, disconnect the negative battery lead
from the battery terminal.)
• To reduce the chance of sparks, do not
•
Positive tester probe

positive battery terminal
•
Negative tester probe

negative battery terminal
Example
Open-circuit voltage = 12.0 V
Charging time = 6.5 hours
Charge of the battery = 20–30 %
1
2
A. Open-circuit voltage (V)
B. Charging time (hours)
C. Relationship between the open-circuit volt-
age and the charging time at 20

C (68

F)
D. These values vary with the temperature, the
condition of the battery plates, and the elec-
trolyte level.
A. Open-circuit voltage (V)
B. Charging condition of the battery (%)
C. Ambient temperature 20

C (68

F)