Batteries Flashcards
What is the purpose of a battery? (Powers what?)
To start the engine
The battery powers the starter motor, ignition and fuel system
How many amps does a starter motor draw? (range)
60-300 amps
What does the alternator provide electrical energy for?
-Ignition System
-Computers
-Lights
-Radio
-Horn
etc..
How is the alternator powered?
Mechanically belt driven by the engine via the accessory drive belt
Automotive batteries convert _____ energy into ____ energy
Automotive batteries convert CHEMICAL energy into ELECTRICAL energy
What is the approximate cost of a battery?
$120 - $200
How many volts are produced by an automotive battery?
12.6 volts fully charged
(6 cells, 2.1 volts each)
What is a batteries expected life in years?
4 to 6 years
Batteries contain a liquid ______ which contains sulfuric acid.
Batteries contain a liquid ELECTROLYTE which contains sulfuric acid.
(Yellow Gatorade baby!!)
Is it important to keep sparks and flames away from a battery?
Yes
What goes do batteries give off when charging?
Hydrogen
What can you do for your vehicle when removing a battery as to preserve the computers data?
Using a memory saver provides power to various modules while the battery is disconnected. Using the connector under the dash.
What is the procedure for battery maintenance? (3)
1) Disconnect and clean terminals and posts
-Use terminal puller if necessary
2) Check fluid levels are over the plates.
-Only if vent caps are removable. Add distilled water if needed.
3) Reinstall terminals ensuring they are fully seated.
-Use a terminal spreader if neccessary.
What is the order in which to take on and off battery terminals form the posts?
NPPN
(Negative off, Positive off, Positive on, Negative on)
How can you tell a positive battery terminal from a negative one if the information has worn away?
-Positive line will connect to starter motor
-Negative line will be connected to frame/chassis
How do you determine the CCA of a battery?
Look for a sticker on the battery indicating CCA
-or use the make and model to search the manufactures website
-or refer to Battery OEM CCA Ratings
When is the procedure for using the the VAT-40 Battery Load Test machine? (specs and values to be monitored)
-Draw ½ the CCA for 15 seconds
(e.g., 650 CCA → pull 325A) If CCA isn’t listed, draw 3× amp-hour rating
-Voltage should stay above 9.5V
(If voltage drops below 9.5V, replace battery)
What is the risk in load testing a ‘borderline’ battery?
It can kill the battery making it unusable.
How do you perform an alternator test?
-Hook up a DMM or Battery Load test machine to the battery
-Start the engine
-Alternator should produce between 13.7 - 14.7 volts
What does CCA stand for?
Cold Cranking Amps
-Measures a battery’s ability to start and engine in cold climates.
