Yamaha JW-II Service Manual page 36

Battery
Display of no. of times
used
F
E
The number of times the battery has been used is displayed, counting one
charging and discharging as one cycle.
Not
Flashing
lighted
0 100 150
to 99 to 149 to 199
Lighted
200 250 300
to 249 to 299 to 349
33
Battery Functions
350
400 or more
to 399