BATTERY STORAGE SYSTEMS QUALIFICATION EXAM
LATEST 2026 VERSION WITH 100 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+||BRAND NEW
VERSION!!
1. Which type of battery is most commonly used for large-scale stationary
energy storage?
A. Nickel-Cadmium
B. Lead-Acid
C. Lithium-Ion
D. Zinc-Carbon
Lithium-ion batteries provide high energy density and longer cycle life,
making them ideal for grid storage.
2. What is the primary purpose of a Battery Management System (BMS)?
A. Increase module weight
B. Monitor and control charging/discharging
C. Add ventilation
D. Improve casing appearance
The BMS protects the battery by ensuring safe charging, discharging, and
balancing of cells.
3. Thermal runaway is best described as:
A. Battery cooling process
B. System shutdown command
C. Uncontrolled rise in temperature causing failure
, D. Electrolyte cleaning
Thermal runaway is a dangerous heat buildup that can lead to fire or
explosion.
4. Which connection method increases battery voltage?
A. Parallel
B. Series
C. Mixed alternating
D. Grounded
Series connections add the voltage of each cell together.
5. Which factor most influences cycle life of lithium-ion batteries?
A. Color of the casing
B. Depth of discharge
C. Connector type
D. Labeling
Deep discharges shorten the useful lifespan of cells.
6. A battery's state of charge (SOC) represents:
A. Number of cells in pack
B. Remaining capacity percentage
C. Battery weight
D. Wire length
SOC measures how much usable energy remains.
7. Which code focuses on fire safety for stationary energy storage systems?
A. NEC Article 310
B. NFPA 855
C. ANSI 22
D. OSHA 1910.120
NFPA 855 sets installation and fire safety requirements for ESS.
8. What is the main hazard of hydrogen gas from lead-acid batteries?
A. Corrosion
B. Noise
, C. Explosion risk
D. Radiation
Hydrogen is highly flammable and can ignite in confined spaces.
9. The unit typically used to rate energy capacity of a battery:
A. Coulombs
B. kWh
C. Ohms
D. BTU/h
Energy storage is quantified as kilowatt-hours.
10.Depth of discharge (DOD) is:
A. Total cell count
B. Percentage of stored energy removed
C. Maximum C-rate
D. Cell temperature
DOD indicates how much energy is used between charges.
11.Which type of fire extinguisher is recommended for lithium-ion battery
fires?
A. Water only
B. Paper-based
C. Class D or clean agent
D. Cooking foam
Lithium-based fires need specialized extinguishing agents.
12.A battery cell nominal voltage for Li-ion is typically around:
A. 1.2V
B. 6V
C. 3.6–3.7V
D. 12V
Most lithium-ion cells operate near 3.6–3.7 volts.
13.Which factor increases risk of thermal runaway?
A. Cool environment
LATEST 2026 VERSION WITH 100 QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+||BRAND NEW
VERSION!!
1. Which type of battery is most commonly used for large-scale stationary
energy storage?
A. Nickel-Cadmium
B. Lead-Acid
C. Lithium-Ion
D. Zinc-Carbon
Lithium-ion batteries provide high energy density and longer cycle life,
making them ideal for grid storage.
2. What is the primary purpose of a Battery Management System (BMS)?
A. Increase module weight
B. Monitor and control charging/discharging
C. Add ventilation
D. Improve casing appearance
The BMS protects the battery by ensuring safe charging, discharging, and
balancing of cells.
3. Thermal runaway is best described as:
A. Battery cooling process
B. System shutdown command
C. Uncontrolled rise in temperature causing failure
, D. Electrolyte cleaning
Thermal runaway is a dangerous heat buildup that can lead to fire or
explosion.
4. Which connection method increases battery voltage?
A. Parallel
B. Series
C. Mixed alternating
D. Grounded
Series connections add the voltage of each cell together.
5. Which factor most influences cycle life of lithium-ion batteries?
A. Color of the casing
B. Depth of discharge
C. Connector type
D. Labeling
Deep discharges shorten the useful lifespan of cells.
6. A battery's state of charge (SOC) represents:
A. Number of cells in pack
B. Remaining capacity percentage
C. Battery weight
D. Wire length
SOC measures how much usable energy remains.
7. Which code focuses on fire safety for stationary energy storage systems?
A. NEC Article 310
B. NFPA 855
C. ANSI 22
D. OSHA 1910.120
NFPA 855 sets installation and fire safety requirements for ESS.
8. What is the main hazard of hydrogen gas from lead-acid batteries?
A. Corrosion
B. Noise
, C. Explosion risk
D. Radiation
Hydrogen is highly flammable and can ignite in confined spaces.
9. The unit typically used to rate energy capacity of a battery:
A. Coulombs
B. kWh
C. Ohms
D. BTU/h
Energy storage is quantified as kilowatt-hours.
10.Depth of discharge (DOD) is:
A. Total cell count
B. Percentage of stored energy removed
C. Maximum C-rate
D. Cell temperature
DOD indicates how much energy is used between charges.
11.Which type of fire extinguisher is recommended for lithium-ion battery
fires?
A. Water only
B. Paper-based
C. Class D or clean agent
D. Cooking foam
Lithium-based fires need specialized extinguishing agents.
12.A battery cell nominal voltage for Li-ion is typically around:
A. 1.2V
B. 6V
C. 3.6–3.7V
D. 12V
Most lithium-ion cells operate near 3.6–3.7 volts.
13.Which factor increases risk of thermal runaway?
A. Cool environment
