Charging
To minimize possible damage to the battery and allow
the battery to be fully charged, the slow charging meth-
od is presented here. This charging method can be ac-
complished with a constant current battery charger
which is available in most shops.
CAUTION
Follow the manufacturer’s instructions when us-
ing a battery charger.
NOTE: Using specific gravity of the battery cells is the
most accurate method of determining battery condition.
1. Determine the battery charge level from either its
specific gravity or open circuit voltage.
CAUTION
60
o
F (15.5
o
Charge the battery in a well–ventilated place to
Nausea may result if the gases are inhaled. Un-
Do not charge a frozen battery because it can ex-
plode and cause injury. Let the battery warm to
C) before connecting to a charger.
dissipate gases produced from charging. These
gases are explosive; keep open flame and elec-
trical spark away from the battery. Do not smoke.
plug the charger from the electrical outlet before
connecting or disconnecting the charger leads
from the battery posts.
3. Following the manufacturer’s instructions, con-
nect the charger cables to the battery. Make sure a good
connection is made.
Battery Charge
Level
Specific
Gravity
Open Circuit
Voltage
100%
1.265
12.68
75%
1.225
12.45
50%
1.190
12.24
25%
1.155
12.06
0%
1.120
11.89
2. Determine the charging time and rate using the
manufacturer’s battery charger instructions or the
following table.
4. Charge the battery following the manufacturer’s
instructions.
5. Occasionally check the temperature of the battery
electrolyte. If the temperature exceeds 125
o
F (51.6
o
C)
or the electrolyte is violently gassing or spewing, the
charging rate must be lowered or temporarily stopped.
6. Three hours prior to the end of the charging, mea-
sure the specific gravity of a battery cell once per hour.
The battery is fully charged when the cells are gassing
freely at a low charging rate and there is less than a
0.003 change in specific gravity for three consecutive
readings.
Electrical
System
Battery
Reserve
Capacity
Capacity
(Minutes)
Battery Charge Level
(Percent of Fully Charged)
75%
50%
25%
0%
80 or less
3.8 hrs
7.5 hrs
11.3 hrs
15 hrs
@
@
@
@
3 amps
3 amps
3 amps
3 amps
81 to 125
5.3 hrs
10.5 hrs 15.8 hrs
21 hrs
@
@
@
@
4 amps
4 amps
4 amps
4 amps
126 to
5.5 hrs
11 hrs
16.5 hrs
22 hrs
170
@
@
@
@
5 amps
5 amps
5 amps
5 amps
171 to
5.8 hrs
11.5 hrs 17.3 hrs
23 hrs
250
@
@
@
@
6 amps
6 amps
6 amps
6 amps
above
6 hrs
12 hrs
18 hrs
24 hrs
250
@
@
@
@
10 amps 10 amps 10 amps 10 amps
Greens Aerator
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Electrical System
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