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10. BATTERY CHARGING
10.1 This charger adjusts the charging time in order to charge the battery
completely, efciently and safely. However, this section includes guidelines
that can be used to estimate charging times.
10.2 The amount of time required to fully charge a weak battery is dependant on
a number of factors. In addition to the degree of discharge, these factors
include the type and rated capacity, temperature, age of the battery, and
amperage rating of the charger. At 70°F (22°C) the average discharged
battery will be recharged as follows.
Battery Charging Chart - Time
Battery Size - Amp Hours
(Ah) Reserve Capacity RC)
Charging Rate - Amps
2-4
amp
6-10
amp
15
amp
20
amp
40
amp
60
amp
Motorcycle/
Garden Tractor
Time to Charge Battery - Shown in Hours (hrs)
Small - (12-22 Ah) 2 hrs NR NR NR NR NR
Large - (22-35 Ah) 5
hrs
3.1
hrs
2.3
hrs
1.75
hrs
0.875
hrs
0.6
hrs
Automotive/Truck
(Groups 24, 27, 31, etc.)
Small -
(70-100 RC)
7.5
hrs
3.75
hrs
2
hrs
1.5
hrs
0.75
hrs
0.5
hrs
Medium -
(100-130 RC)
9
hrs
4.5
hrs
2.4
hrs
1.8
hrs
0.9
hrs
0.6
hrs
Large -
(130-160 RC)
12
hrs
6
hrs
3.2
hrs
2.4
hrs
1.2
hrs
0.8
hrs
Heavy Duty -
(160-190 RC)
15
hrs
7.5
hrs
4
hrs
3
hrs
1.5
hrs
1
hrs
Charging Times are based on a 50% discharged battery - approx
12-12.2 volts.
NR = Not Recommended.
Charging times will vary with battery type and condition.
10.3 Battery State – If a battery has only been slightly discharged, it can be
charged in less than a few hours. The same battery could take up to 10
hours if very weak. The battery state can be estimated by using the built-in
tester. The lower the reading the longer charging will take.
10.4. Battery rating – A higher rated battery will take longer to charge than
a lower rated battery under the same conditions. A battery is rated in
ampere-hours (AH), reserve capacity (RC) and cold cranking amps (CCA).
The lower the rating the quicker the battery will be charged.
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