Hybrid Battery

It may be NiMH or lithium-ion. It is cooled by air or liquid. It lasts many years. Hybrid batteries are usually under the rear seat or boot floor and are cooled by a fan drawing cabin air. Keeping the air intake clear of bags and dust is important. Many hybrid batteries last well over a decade, and replacement or refurbished units are available when they do fail.

It stores energy from braking and the engine.

Blocked cooling vents cause overheating. Reconditioning is available.