High-voltage Battery

Most use lithium-ion cells; some hybrids still use nickel-metal hydride. Voltages range from about 48 V in mild hybrids to 400 V or 800 V in electric cars. Orange cables mark high-voltage parts. The battery is cooled or heated by liquid or air to keep it in its preferred temperature range, which protects its life and keeps charging fast.

Many cells are connected in modules; a management system monitors and balances them.

Capacity slowly decreases with age and use; manufacturers usually give a separate warranty. Never open or repair it without training and proper equipment.