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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 you rbattery 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).
• Marine, or deep cycle batteries are usually rated in either Amp-Hours or Reserve
Capacity (RC).
Charge Time Table for Batteries at 50% State-of-Charge
Battery Battery Rating Charge-Time (Hours)
Type AH RC CCA 2 AMP 10 AMP 60 AMP
Motorcycle 6 - 12 2 - 4 NA NA
and Tractor 12 - 32 4 - 10 NA NA
Car and 40 - 60 200 - 315 8- 11 1 - 2 NA
Truck 60 - 85 315 - 550 11 - 16 2 - 3 NA
85 -190 550- 1000 16-35 3-7 NA
Marine and 40 80 15 3 NA
Deep Cycle 80 140 26 5 NA
95 160 30 6 NA
105 180 33 7 NA
NA = Not Allowed. DO NOT charge at this setting.
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-Charger Tester. Use the table below to convert
Voltmeter and State-of-Charge readings at room temperature to the appropriate Charge
Factor. Then use the formulas that follow the table to determine the approximate charge
time.
Charge Factor Table
12 Volt Battery
12.67
12.45
12.25
12.06
11.86
6 Volt Battery
6.34
6.22
6.12
6.03
5.93
State-of.Charge
Reading
100%
75%
50%
25%
O%
0
0.25
0.50
0.75
1
11