Yamaha NAVIGO Owner's Manual page 68

(3) 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 conditions.
8
TIP For a nickel metal hydride battery, its capacity will decrease to approximately 60% of that of a
new battery after 300 charge/discharge cycles, under normal use.
Even if a battery is not used, when it is stored over a long period of time, its capacity will decrease.
When you are using multiple batteries, alternate between the batteries.
The extent of the deterioration of a nickel metal hydride battery can be checked after charging is
done, by pushing the indicator switch.
62
The 5th lamp does not turn
on even after charging is
complete.
Indicator
switch
T h e c a p a c i t y h a s
deteriorated to less
than 80%
The 4th and 5th lamps
do not turn on even after
charging is complete.
The capacity has de-
teriorated to less than
60%