Battery Load Test - AutoEdu - Procedure

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Home
Tools and Equipment
- Tools
  - Hand tools
    - Wrenches
    - Socket wrenches
    - Torque wrench
    - Torque angle gauge
    - Oil filter wrench
    - Screwdrivers
    - Pliers
    - Crimping pliers
    - Hammers
    - Chisels and punches
    - Pullers
    - Thread tapping
    - Pop rivet guns
    - Flaring tools
    - Suspension tools
  - Air tools
    - Air compressor
    - Air system drying and lubrication
    - Air nozzle
    - Tire inflator gun
    - Air impact wrench
    - Air ratchet
    - Air drill
    - Air hammer
    - Air grease gun
  - Electric tools
    - Drill
    - Angle grinder
    - Electric screwdriver
    - Soldering iron
- Workshop equipment
  - Vehicle hoists
  - Jacks
  - Jack stands and wheel chocks
  - Engine stands
  - Bench vice
  - Bench grinder
  - Ultrasonic bath
- Measuring equipment
  - Measuring tapes and ruler
  - Feeler gauges
  - Vernier Caliper
  - Micrometer
  - Dial Indicator
  - Test light
  - Circuit tester probe
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  - Current clamp
  - Diagnostic tool
  - Automotive oscilloscope
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    - Hand Protection
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    - Eye Protection
    - Hearing Protection
    - Safety Footwear
    - Protective Mask
    - Safe Lifting
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    - Safety Policies and Procedures
    - Safety Signs
    - Tools and Equipment Safety
    - Vehicle Protective Equipment
    - Workshop Ventilation
    - Slip, Trip, and Fall Hazards
    - Electrical Safety
    - Fire protection
Auto Mechanics
- Technical maintenance
  - Engine oil check
  - Engine coolant check
  - Brake fluid check
  - Power steering fluid check
  - Checking windshield washer system
  - Vehicle lighting check
  - Under vehicle inspection
  - Engine air filter replacement
  - Changing engine oil and filter
- Engine
  - Engine mechanical testing
    - Fluid leakage
    - Engine noise diagnostics
    - Engine vacuum testing
    - Cylinder power balance test
    - Cranking compression test
    - Running compression test
    - Cylinder leakage test
  - Cylinder Head Repair
    - Removing cylinder heads
    - Disassembling and cleaning a cylinder head
    - Cylinder head inspection
    - Cylinder head pressure testing
    - Cylinder head magnaflux crack detection
    - Penetrant testing cylinder head
    - Valves and valve seats inspection
    - Inspecting valve guides and clearance
    - Inspecting valve springs
- Brakes
  - Hydraulic braking system
    - Brake fluid handling
    - Testing brake fluid with a multimeter
    - Brake fluid boiling point test
    - Testing brake fluid with a refractometer
    - Manual bleeding
    - Pressure bleeding
    - Vacuum bleeding
    - Checking the brake pedal
    - Testing the master cylinder
    - Bench bleeding a master cylinder
    - Adjusting master cylinder pushrod length
    - Checking the vacuum brake booster
    - Checking vacuum supply to the power booster
    - Checking vacuum leaks from the power booster
    - Testing the vacuum check valve
    - Inspecting brake lines and hoses
  - Drum brake
  - Disc brake
    - Checking disc brake rotors
    - Replacing disc brake rotors
- Steering systems
  - Diagnosis based on customer concerns
  - Noise-based diagnosis
  - Steering system visual inspection
  - Power steering fluid check
  - Diagnosing power steering fluid leakage
  - Bleeding a power steering system
  - Flushing a power steering system
  - Power steering pressure test
  - Power steering pump replacement
  - Steering pump pulley replacement
  - Replacing power steering hoses
  - Inspecting mounting bushings and brackets
  - Rack and pinion inspection
  - Rack and pinion replacement
  - Inspecting the steering column
- Suspension systems
  - Sway bar link replacement
  - Strut bearing replacement
Auto Electric
- Battery
  - Battery inspection
  - Battery replacement
  - Battery Leakage Test
  - Cleaning the battery poles and terminals
  - Jump-Starting the vehicle
  - Battery charging
  - Battery voltage test
  - Hydrometer testing
  - Built-In hydrometers
  - Battery load test
  - Battery conductance test
  - Saving memory after battery removal
  - Measuring parasitic draw
- Alternator
  - Drive belt inspection
  - Alternator noises
  - Voltage output testing
  - Voltage drop testing
  - Alternator removal
  - Alternator disassembly
  - Checking and replacing alternator brushes
  - Slip ring inspection
  - Alternator rotor testing
  - Alternator stator testing
  - Alternator diode testing
  - Voltage regulator testing
  - Alternator bearing replacement
  - Oscilloscope alternator test
  - AC ripple voltage test
  - Alternator leakage test
  - Test of ECU-controlled charging system
- Electrical installations
  - Relays – testing
Auto Electronics
- Sensors
  - Mode sensors
  - Mode sensor test
  - Temperature sensors
  - Testing temperature sensor
  - MAP sensor test
  - Testing an Oxygen/Lambda sensor
- Gasoline injection systems
  - Air intake
    - Engine air filter check
    - Intake manifold testing
    - Throttle valve check
    - Throttle valve sensor test
    - Idle air control valve test
    - Accelerator-pedal module test
- Comfort systems
  - Air conditioning
    - Charging the Air-Conditioning system
Lessons
- Petrol Injection

Battery load test

A battery load test determines how well the battery performs under load. The test determines the battery’s ability to deliver starting current and maintain sufficient voltage to operate other systems. In other words, if the battery can sustain a high discharge for some time and the voltage is still relatively high, then you know the battery has good capacity and is in good condition. If the voltage drops quite quickly, the battery capacity is low.

The battery load tester serves to carry out the load test. It contains an ammeter, a voltmeter, and a high power variable resistor. Depending on the strength of the battery, the amount of load for testing is determined. The tester draws current from the battery through the resistor. An ammeter measures the amount of current drawn. The maximum draw current and battery voltage drop define the battery state.

There are several prerequisites for the battery test. The battery electrolyte should be at room temperature, between 21°C and 27°C. A cold battery shows a significantly lower capacity. Never test a sealed battery if its temperature is below 15°C. A load test is performed only on a fully charged battery.

Battery load tester

When testing the battery load, use the following test parameters:

Test load = half of the starting current of the battery
Loading test time = 15 seconds
Results: Pass = 9.6 V or greater; Error = less than 9.6V

If the battery fails the load test, another test is required before a final judgment is made on the battery. Charge the battery with a 20-hour charging current and repeat the load test. If the test results are still weak, the battery is sulfated and must be replaced with a new battery. If it passes the retest, test the vehicle’s charging system to see if it is properly charging the battery.

Some manufacturers emphasize that their batteries should not be load tested, but instead tested for conductivity. They claim that load testing can damage the battery. Therefore, always check the service information for a given battery before performing a load test.

To perform a battery load test, follow these steps:

Connecting testers

Use an infrared temperature gun to measure the temperature on the side of the battery and check that it is within the test parameters. Connect the red clip to the plus pole of the battery and the black to the minus pole.

Testing

If using an automatic load tester, enter the starting battery current. When using a handheld load tester, calculate the load, which is usually half the starting current (eg 700A/2 = 350A – test current), and set the load.

Results analysis

Test for 15 seconds. Read the test voltage on the voltmeter and immediately turn off the tester. If after 15 seconds the test voltage is 9.6 V or higher, the battery is good. When the test voltage is less than 9.6 V, charge the battery and repeat the load test. If the voltage is lower than 9.6V again, the battery is faulty. However, if the repeated test voltage is higher than 9.6V, check the power supply system.

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