Patent encumbrance of large automotive NiMH batteries

The patent encumbrance of large automotive NiMH batteries refers to allegations that corporate interests have used the patent system to prevent the commercialization of nickel metal hydride (NiMH) battery technology. Nickel metal hydride battery technology was considered important to the development of battery electric vehicles (BEVs or EVs), plug-in hybrid electric vehicles (PHEVs) and hybrid electric vehicles (HEVs) before the technology for lithium-ion battery packs became a viable replacement.

Source: Wikipedia — Patent encumbrance of large automotive NiMH batteries (CC BY-SA 4.0)