Yamaha JWX-1 Owner's Manual page 70

(2) Battery's deterioration characteristics
All batteries are consumables. A battery gradually deteriorates and its capacity decreases
over time and with use.
The extent to which the capacity decreases by deterioration depends on the use condi-
tions.
Even if a battery is not used, when it is stored over a long period of time, it will deteriorate
and its capacity will decrease.
When you are using multiple batteries, alternate between the batteries.
Immediately after the lithium ion battery has successfully completed charging (fully
TIP
charged), pushing the indicator switch will always show all 5 lamps lit. Even if dete-
rioration has progressed, all 5 lamps should turn on when fully charged. This display
format was adapted for this battery, as the rate of deterioration of lithium ion batteries
is gradual.
(3) The life of the lithium ion battery
The life of the lithium ion battery (ESB1) is 8 years from its initial charging, or 8,000 Ah of
integral charge capacity.
• Battery life alert
The capacity indicator lamp starts alert-
ing you from 3 months prior to the bat-
ter y becoming no longer chargeable
due to its end-of-life, or when the inte-
gral charge capacity reaches 7,800 Ah.
When charging has completed and the
charge plug is unplugged, the capacity
i n d i c a t o r l a m p t u r n s o n a n d o f f a s
shown in the figure on the right.
• When the battery reaches end of life
Once the battery reaches its end of life, the lamp on the charger will not turn
on when attempting to charge the battery. Moreover, the battery's capacity
indicator lamp no longer turns on and the batter cannot be charged.
The capacity lamp turns
on and off for 5 seconds,
in the order of the ar-
rows.
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