H. Using the table below, determine the minimum
voltage for the electrolyte temperature of the center
battery cell:
Battery
Reserve
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
@ @ @
Minimum
Voltage
Battery Electrolyte
Temperature
3
amps
3 amps 3 amps 3 amps
9.6
9.5
9.4
9.3
9.1
8.9
8.7
8.5
70o F (and up)
60oF
21.1o C (and up)
81
to 125 5.3 hrs 10.5 hrs 15.8 hrs 21 hrs
15.6oC
10.0oC
4.4oC
@
amps
@ @ @
4 amps 4 amps 4 amps
50oF
4
40oF
126
to
to
5.5 hrs
@
11 hrs
@
5 amps 5 amps 5 amps
16.5 hrs 22 hrs
170
@ @
30oF
--1.1oC
--6.7oC
--12.2oC
--17.8oC
5
amps
20oF
171
5.8 hrs 11.5 hrs 17.3 hrs 23 hrs
10oF
250
@
amps
@ @ @
6 amps 6 amps 6 amps
6
0oF
above
250
6 hrs
@
12 hrs
@
18 hrs
@
24 hrs
@
I. If the test voltage is below the minimum voltage
showninthechart,replacethebattery.Ifthetestvolt-
age is at or above the minimum, return the battery to
service.
10
amps 10 amps 10 amps 10 amps
CAUTION
Battery Charging
To minimize possible damage to the battery and to 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 readily available.
Do not charge a frozen battery because it can ex-
plode and cause injury. Let the battery warm to
60
o F (16o C) before connecting to a charger.
Charge the battery in a well--ventilated place to
dissipate gases produced from charging. These
gases are explosive; keep open flame and elec-
trical spark away from the battery. Do not smoke.
Nausea may result if the gases are inhaled. Un-
plug the charger from the electrical outlet before
connecting or disconnecting the charger leads
from the battery posts.
CAUTION
Follow the battery charger manufacturer’s
instructions when using a battery charger.
3.
Following the battery charger manufacturer’s
instructions, connect the charger cables to the battery.
Make sure a good connection is made.
NOTE: Using specific gravity of the battery cells is the
most accurate method of determining battery condition.
1.
specific gravity or open circuit voltage.
Determine the battery charge level from either its
4.
manufacturer’s instructions.
Charge the battery following the battery charger
Battery Charge
Level
Specific
Gravity
Open Circuit
Voltage
5. Occasionally check the temperature of the battery
electrolyte. Ifthe temperature exceeds 125oF(52oC)or
the electrolyte is violently gassing or spewing, the
charging rate must be lowered or temporarily stopped.
100%
75%
50%
25%
0%
1.265
1.225
1.190
1.155
1.120
12.68
12.45
12.24
12.06
11.89
6.
Three(3)hours priortotheendofthecharging,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.
2.
Determine the charging time and rate using thebat-
tery charger manufacturer’s instructions or the fol-
lowing table.
Electrical System
Page 5 -- 66
Groundsmaster 5900/5910
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