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Battery Rating Method
Use the following table to more accurately determine the time it will take to fully
charge a battery that is initially at 50% State-of-Charge. Identify your battery type and
its associated Charge Time in the table. Common battery types are:
• Small batteries, motorcycles, garden tractors, etc., are usually rated in Amp-Hours
(AH).
• Car and truck batteries, usually rated in Reserve Capacity (RC), Cold Cranking
Amps (CCA), or both.
• Marine, or deep cycle batteries, usually rated in either Amp-Hours or Reserve
Capacity (RC).
• NR means the charger setting is NOT RECOMMENDED.
• NA means not allowed. DO NOT charge at this setting
Charge Time Table for Batteries at 50% State-of-Charge
Battery
Type
6 - 12
Motorcycle
and tractor
12 - 32
Car and
Truck
Marine and
Deep Cycle
Gel Cell
Voltmeter Method
To find the time needed to fully charge your battery, determine the battery's charge
level with a voltmeter or electronic State-of-ChargeTester. Use the table below to
convert Voltmeter and State-of-Charge readings at room temperature to the appro-
priate Charge Factor. Then use the formulas that follow the table to determine the
approximate Charge Time.
Voltmeter Reading
12 Volt Battery
12.67
12.45
12.25
12.03
11.86
CALCULATING CHARGE TIME
Battery Rating
AH
RC
200 - 315
40 - 60
315 - 550
60 - 85
550 - 1000
85 -190
40
80
80
140
95
160
105
180
40
80
Charge Factor Table
24 Volt Battery
25.34
24.90
24.50
24.06
23.72
CCA
2 AMP
2 - 4
4 - 10
8 - 11
11 - 16
16 - 35
15
26
30
33
390
20
650
32
State-of-Charge
Reading
100%
75%
50%
25%
100%
11
Charge-Time (Hours)
10 AMP
15 AMP
NA
NA
NA
NA
1 - 2
1 - 1½
2 - 3
1½ - 2
3 - 7
2 - 5
3
2
5
3½
6
4
7
4½
6
NR
10
NR
Charge Factor
0
0.25
0.50
0.75
1
20 AMP
NA
NA
¾ - 1
1 - 1½
1½ - 3½
1½
2½
3
3½
NR
NR
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