Title: Module 4: Battery Charging - Quiz
Course: ASE A6 Battery Service > Section: Module 4: Battery Charging

Q: A slow (trickle) charge rate for a standard automotive battery is typically:
- 0.5-1 amp
- 2-10 amps
- 30-50 amps
- 100-200 amps
A: 2-10 amps
Feedback: Slow charge rates are typically 2-10 amps. This allows the chemical reaction to proceed evenly with minimal heat and gassing.

Q: The three stages of automatic battery charging are, in order:
- Float, absorption, bulk
- Bulk, float, absorption
- Bulk, absorption, float
- Absorption, bulk, float
A: Bulk, absorption, float
Feedback: Modern automatic chargers follow three stages: bulk (maximum current), absorption (constant voltage, decreasing current), then float (low maintenance voltage).

Q: The maximum charging voltage for an AGM battery should not exceed approximately:
- 13.2V
- 14.0V
- 14.6V
- 15.5V
A: 14.6V
Feedback: AGM batteries should not exceed approximately 14.4-14.6V during charging. Exceeding this causes the pressure relief valve to vent gas that cannot be replaced, permanently reducing capacity.

Q: Technician A says a frozen battery should be charged immediately to thaw it. Technician B says a frozen battery should not be charged and should be replaced. Who is correct?
- Technician A only
- Technician B only
- Both Technician A and Technician B
- Neither Technician A nor Technician B
A: Technician B only
Feedback: Never charge a frozen battery — it can crack the case or explode. A battery that has frozen has sustained internal damage from ice expansion (cracked plates, damaged separators) and should be replaced.

Q: A battery reads 10.3V. Technician A says to fast charge it to get a quick reading. Technician B says a battery below 10.5V may be severely sulfated and may not accept a charge. Who is correct?
- Technician A only
- Technician B only
- Both Technician A and Technician B
- Neither Technician A nor Technician B
A: Technician B only
Feedback: A battery below 10.5V is likely severely sulfated. The hardened sulfate crystals may prevent the battery from accepting a charge. Forcing high current into it can cause overheating.

Q: When connecting a battery charger, the correct order is:
- Negative clamp first, then positive clamp
- Positive clamp first, then negative clamp
- Both clamps simultaneously
- Either order is acceptable
A: Positive clamp first, then negative clamp
Feedback: Connect positive first, then negative. This minimizes spark risk near the battery where hydrogen gas may be present.

Q: A fully discharged lead-acid battery can freeze at approximately:
- -75°F (-60°C)
- -10°F (-23°C)
- 20°F (-7°C)
- 32°F (0°C)
A: 20°F (-7°C)
Feedback: A fully discharged battery (SG 1.120) freezes at approximately 20°F (-7°C). A fully charged battery (SG 1.265) won't freeze until -75°F. The weaker the electrolyte, the higher the freeze point.

Q: During the absorption stage of charging:
- Maximum current is applied and voltage rises rapidly
- Voltage is held constant and current gradually decreases
- Both voltage and current are at their maximum levels
- The charger shuts off completely
A: Voltage is held constant and current gradually decreases
Feedback: During absorption, the charger holds voltage constant (around 14.4-14.7V) while current gradually decreases as the battery approaches full charge.

Q: A battery maintainer (tender) is designed to:
- Fast charge a dead battery in under an hour
- Maintain a fully charged battery at float voltage during storage
- Load test a battery while charging
- Replace the alternator during driving
A: Maintain a fully charged battery at float voltage during storage
Feedback: A maintainer keeps a fully charged battery at float voltage (13.2-13.6V) to prevent self-discharge during storage. It is not designed to charge a dead battery.

Q: A customer has an AGM battery in their vehicle. The charger in the shop only has a "standard" (flooded) setting. What is the concern?
- The charger will not work on an AGM battery
- The charging voltage may exceed the AGM limit and damage the battery
- The charger will charge too slowly for an AGM battery
- There is no concern — AGM batteries charge the same as flooded
A: The charging voltage may exceed the AGM limit and damage the battery
Feedback: A flooded setting may allow the charging voltage to reach 14.7V, which exceeds the AGM maximum of 14.6V. This can cause the pressure relief valve to open, permanently reducing capacity.

Q: Which charging method provides the most thorough and complete charge?
- Fast charge at 50 amps for 1 hour
- Slow charge at 5 amps for 12-16 hours
- Jump starting and driving for 30 minutes
- Float charging for 2 hours
A: Slow charge at 5 amps for 12-16 hours
Feedback: Slow charging at low amperage allows the chemical reaction to proceed evenly across all plate surfaces, converting more lead sulfate back to active material than any other method. It provides the most complete charge.