___ are typically used in EVs for ancillary loads.

___ are typically used in EVs for ancillary loads.

• A. Ultracapacitors
• B. Lithium-ion batteries
• C. Nickel-metal hydride batteries
• D. Lead-acid batteries

Answer: (D)

Ancillary loads in an EV are powered by a low-voltage 12V system separate from the high‑voltage traction pack. A DC‑DC converter from the main pack feeds a 12V battery that runs lights, infotainment, and control modules. Lead-acid batteries are favored here because they are cheap, rugged, and provide reliable, area-made power for these steady loads, even though they’re heavier and have shorter life than modern chemistries. Ultracapacitors are designed for short, high-power bursts, not long‑term, steady ancillary power. Nickel-metal hydride is mainly found in older hybrids, not typical in current EVs. Lithium-ion batteries power the main propulsion, and while some designs explore lithium for 12V, the traditional and most common choice for auxiliaries remains lead-acid.

Ancillary loads in an EV are powered by a low-voltage 12V system separate from the high‑voltage traction pack. A DC‑DC converter from the main pack feeds a 12V battery that runs lights, infotainment, and control modules. Lead-acid batteries are favored here because they are cheap, rugged, and provide reliable, area-made power for these steady loads, even though they’re heavier and have shorter life than modern chemistries. Ultracapacitors are designed for short, high-power bursts, not long‑term, steady ancillary power. Nickel-metal hydride is mainly found in older hybrids, not typical in current EVs. Lithium-ion batteries power the main propulsion, and while some designs explore lithium for 12V, the traditional and most common choice for auxiliaries remains lead-acid.