Yamaha 50H Owner's Manual page 20

EMU01775
BATTERY REQUIREMENT
cC
Do not use a battery that does not meet
the specified capacity. If a battery which
does not meet specifications is used, the
electric system could perform poorly or
be overloaded, causing electric system
damage.
For electric start models, choose a battery
which meets the following specifications.
EMU01856
Minimum cold cranking amps
(CCA/EN):
347 amps at -18°C (-0.4°F)
Minimum rated capacity (20HR/IEC):
40 A·h
1-6
GB