Yamaha XG250, Service Manual

Page: 261 / 278

ELECTRICAL COMPONENTS
7-38
EAS28030
CHECKING AND CHARGING THE BATTERY
WARNING
EWA13290
Batteries generate explosive hydrogen gas
and contain electrolyte which is made of poi-
sonous and highly caustic sulfuric acid.
Therefore, always follow these preventive
measures:
●
Wear protective eye gear when handling
or working near batteries.
●
Charge batteries in a well-ventilated area.
●
Keep batteries away from fire, sparks or
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
injury.
FIRST AID IN CASE OF BODILY CONTACT:
EXTERNAL
●
Skin — Wash with water.
●
Eyes — Flush with water for 15 minutes
and get immediate medical attention.
INTERNAL
●
Drink large quantities of water or milk fol-
lowed with milk of magnesia, beaten egg
or vegetable oil. Get immediate medical at-
tention.
CAUTION:
ECA13660
●
This is a sealed battery. Never remove the
sealing caps because the balance be-
tween cells will not be maintained and bat-
tery performance will deteriorate.
●
Charging time, charging amperage and
charging voltage for an MF battery are dif-
ferent from those of conventional batter-
ies. The MF battery should be charged as
explained in the charging method illustra-
tions. If the battery is overcharged, the
electrolyte level will drop considerably.
Therefore, take special care when charg-
ing the battery.
NOTE:
Since MF batteries are sealed, it is not possible
to check the charge state of the battery by mea-
suring 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 (right)
Refer to “GENERAL CHASSIS” on page 4-1.
●
Battery band
2. Disconnect:
●
Battery leads
(from the battery terminals)
CAUTION:
ECA13640
First, disconnect the negative battery lead
“1”, and then positive battery lead “2”.
3. Remove:
●
Battery
4. Check:
●
Battery charge
▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼▼
a. Connect a pocket tester to the battery termi-
nals.
NOTE:
●
The charge state of an MF battery can be
checked by measuring its open-circuit voltage
(i.e., the voltage when the positive battery ter-
minal is disconnected).
●
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.
●
Positive tester probe
→
positive battery terminal
●
Negative tester probe
→
negative battery terminal
1
2