This is what Wikipedia says about the first generation Toyota RAV-4 EV program, which is what you seem to be referring to:
Chevron Patent EncumbranceEdit
Main article:
Patent encumbrance of large automotive NiMH batteries
Whether or not Toyota wanted to continue production, it was unlikely to be able to do so because the EV-95 battery was no longer available. Chevron had inherited control of the worldwide patent rights for the NiMH EV-95 battery when it merged with Texaco, which had purchased them from General Motors. Chevron's unit won a US$30,000,000 settlement from Toyota and Panasonic, and the production line for the large NiMH batteries was closed down and dismantled. This case was settled in the ICC
International Court of Arbitration, and not publicised due to a
gag orderplaced on all parties involved.
[19][20] Only
smaller NiMH batteries, incapable of powering an electric vehicle or plugging in, were allowed by Chevron-Texaco.
[21]