Yamaha 2002 CS50, Service Manual, Page: 59 / 204

CHK
ADJ
CHECKING AND CHARGING THE BATTERY
3-29
Charging method using a constant voltage charger
Measure the open-circuit
voltage prior to charging.
Connect a charged 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.
Charge the battery until the
battery’s charging voltage
is 15 V.
This type of battery charger
cannot charge the MF battery.
A variable voltage charger is
recommended.
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.
NOTE:
Voltage should be measured 30 minutes after the
machine is stopped.
YES NO
NOTE:
Set the charging time at 20 hours
(maximum).