Yamaha YFM660FS Grizzly 4x4 Supplementary Service Manual page 206

CHECKING THE BATTERY
Batteries generate explosive hydrogen gas.
Always follow these preventive measures:
Charge batteries in a well-ventilated area.
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Keep batteries away from fire, sparks or
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open flames (e.g., welding equipment,
lighted cigarettes, etc.)
DO NOT SMOKE when charging or han-
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dling batteries.
KEEP BATTERIES AND ELECTROLYTE
OUT OF REACH OF CHILDREN.
1.Remove:
Seat
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Battery holding bracket
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Battery lead cover
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Refer to "SEAT, CARRIERS, FENDERS
AND FUEL TANK".
2.Disconnect:
Battery leads
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CAUTION:
First disconnect the negative lead 1, then
disconnect the positive lead 2.
3.Remove:
Battery
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4.Check:
Battery condition
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Checking steps:
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Connect a digital voltmeter to the battery ter-
minals.
Tester (+) lead → battery (+) terminal
Tester (–) lead → battery (–) terminal
NOTE:
The charge state of an MF battery can be
checked by measuring the open-circuit voltage
(i.e. the voltage when the positive terminal is
disconnected).
Open-circuit
voltage
12.8 V or higher
3 - 59
CHK
ADJ
Charging time
No charging is
necessary.