Honda BF9.9A Owner's Manual page 12

6. Battery connections (for electric starter)
Use a
12V40AH battery.
Place the battery in a corrosion-resistant battery box and fix the
battery box securely to the hull.
Install the battery box in a location such that remains level while the
boat is cruising and is not exposed to spray or direct sunlight.
Connecting the battery cord
1. Connect the cable with the red terminal cover to the (+) side of the
battery.
2. Connect the cable with the black terminal cover to the (-1 side of the
battery.
(-)lERMINAL
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Be sure to connect the (+) side battery cable first. When
disconnecting the cables, disconnect the (- 1 side first then the (+ 1
side.
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Unless the cables are properly connected to the terminals, the
starter motor may fail to operate normally.
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Do not place the fuel tank near the battery.