Yamaha JWX-1 Owner's Manual page 94

Battery and Charger
Battery
Battery Charger
*4 The Ni-MH battery and Li-ion battery each have a dedicated charger. The dedicated chargers are not interchangeable.
Model
Type
Nominal output voltage
Rated output (5-hour rate)
Model
Charging method
Rated output during charging
Chargeable battery
Time for normal
charging
Charging time
Time for refresh
charging
Nickel-Metal Hydride
JWB2
Rechargeable Dry Battery
with built in microprocessor
24 V
6.7 Ah (160.8 Wh)
JWC-2
Automatic Charging
controlled by the microprocessor
29 V · 2.6 A
JWB2 *4
2.5 –3.5 hr
3 –13 hr
Lithium-ion
ESB1
25 V
11.8 Ah (280 Wh)
ESC1
13
29.2 V · 3 A
ESB1 *4
Approx. 4.5 hr
—
89