Yanmar 3YM30 Sevice Manual page 42

2. Inspection and adjustment
(2) Check the electrolyte level in the battery
Battery structure
Fire due to electric short-circuit
• Make sure to turn off the battery switch or disconnect the negative cable
(-) before inspecting the electrical system. Failure to do so could cause
short-circuiting and fires.
• Always disconnect the (-) Negative battery cable first before
disconnecting the battery cables from battery. An accidental "Short
circuit" may cause damage, fire and or personal injury.
And remember to connect the (-) Negative battery cable (back onto the
battery) LAST.
Proper ventilation of the battery area
Keep the area around the battery well ventilated, paying attention to keep
away any fire source. During operation or charging, hydrogen gas is
generated from the battery and can be easily ignited.
Do not come in contact with battery electrolyte
Pay sufficient attention to avoid your eyes or skin from being in contact
with the fluid. The battery electrolyte is dilute sulfuric acid and causes
burns. Wash it off immediately with a large amount of fresh water if you
get any on you.
Terminal
Battery
case
27
Cap
Cover
Cathode
plate
Separator
Glass mat
Anode plate