Yamaha 9.9F Manuel D'utilisation page 20

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BATTERY REQUIREMENT
cC
Do not use a battery that does not meet
the specified capacity. If a battery which
differs from the specification is used, the
electrical system may perform poorly or
be overloaded, causing electrical system
damage.
cC
Models with only a rectifier installed:
9.9FWH, 15FWC
8 Using a maintenance-free battery with
the above models can shorten the life
of the battery significantly.
8 Use caution when connecting acces-
sories such as fish finders, as they may
be damaged by high voltage. Install an
optional rectifier regulator or use acces-
sories rated to withstand 18 volts or
higher with the above models. Consult
your Yamaha dealer for details on
installing an optional rectifier regulator.
Choose a battery for electric start models
which meets the following specifications.
Battery capacity :
12V, 40~70Ah (144~252kc)
1-6
GB