Electrical/Electronic Systems Work Example 2

WorkKey Level: 3
NATEF Automotive Tasks: VI.B.1

While testing a battery under no load, the battery has 12 ¼ volts.  What is the approximate state of charge percentage according to the chart below? 

Open Circuit Volts	Percentage of Charge OR State of Charge
11.7 volts or less	0%
12.0 volts	25%
12.2 volts	50%
12.4 volts	75%
12.6 volts or more	100%

 

 

 

 

Solution:

12 1/4 = 12.25 which is approximately 12.2
Reading from the chart, the percentage of charge is approximately 50%.