Yamaha 2002 TW125 Supplementary Service Manual page 31

CHECKING AND CHARGING THE BATTERY
Charging method using a constant voltage charger
YES
Charge the battery until the battery's
charging voltage is 15 V. Charge the
battery until the battery's charging
voltage is 15 V.
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.
Measure the open-circuit
voltage prior to charging.
Connect a charger and
AMP meter to the battery
and start charging.
Make sure that the current
is higher than the standard
charging current written on
the battery.
NOTE:
Set the charging time at 20 hours
(maximum).
This type of battery charger cannot
charge the MF battery. A variable
voltage charger is recommended.
–25–
CHK
ADJ
NOTE:
Voltage should be measured 30
minutes after the machine is stopped.
NO