BATTERY
description
Transcript of BATTERY
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BATTERY
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BATTERY
•Converts chemical energy into electrical energy.
•Starts engine, operates accessories (only when engine is not running)
•Stores energy
•Automotive battery is 12.6 volts
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BATTERY•Six cells, each 2.1volts.•Each cell has a negative and a positive plates
•Plates are immersed in electrolyte (60% Water & 40% Sulfuric Acid)
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BATTERY
•Top post battery •Side post battery
•Two posts – Negative (Ground/black); Positive (Power/red)
•Maintenance-free •Maintenance
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BATTERY•During charging, battery produces Hydrogen.
•Electrolyte is lost during charging•Only water vaporizes•Add water
Specific gravity of a battery is checked with a hydrometer.
•Water if specific gravity is 1.000
•Electrolyte if specific gravity is 1.275
***Do not let electrolyte to come in contact with clothes or skin•Wear proper eye protection when working with or around battery.
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BATTERY RATING•20 hours rate amount of current a battery can deliver for 20 hrs. without cell voltage dropping below 1.75 volts.
•Cold Cranking Rating how much current a battery can deliver for 30 seconds at 0°F while maintaining terminal voltage of 7.2 volts.
•Reserve Capacity time required to reduce voltage of a battery from 12.6 volts to 10.2, when sustained load of 25 Amps is applied at 80ºF.
** Battery is discarded if voltage drops less then 9.6 volts.
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BATTERY TEST
LOAD TEST
•Load to three times the amps/hour rating for 15 secondsor
•Load half of CCA for 15 seconds
If battery is good, voltage should stay above 9.6 volts.
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BATTERY TEST
If Load Test Fails
3 Minutes Charge Test
If load test is failed, charge at high rate (50 Amps) for three minutesChecking voltage at completion (while still charging)
Good battery >> Less than 15.5 Volts
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Removing Battery
•Disconnect Negative (-) terminal first•Connect Positive (+) terminal first
Use proper puller, not Screwdriver
Clean terminals/posts with
Or with baking soda mixed with warm water
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Battery Service
When installing the terminals, use Expander to expand the terminals, DON’T use hammer.
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Battery Drain Test
If battery is draining over night, you need to perform a battery drain test
•Remove –ve terminal•Hook DVOM or test light in series with the post/terminal.•With everything off, no light on/voltage reading.•If light on/getting voltage reading, battery is being drained. •Isolate the circuit by pulling one fuse at a time.
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Voltage Drop Test
Quick check to find if terminals needs cleaning:
•Measure voltage drop across post to terminal
•Crank the engine (disable Fuel/ignition)
•While cranking, if reading over 0.5V indicates terminal cleaning. MAXIMUM 15 seconds
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BATTERY