Abstract6.1 Introduction6.2 Technical description of NiMH and NiZn batteries6.3 Electrical performance, lifetime, and cost of NiMH and NiZn batteries6.4 Advantages and disadvantages of NiMH and NiZn batteries in HEVs and battery electric vehicles6.5 Design issues of NiMH and NiZn batteries in HEVs and battery electric vehicles6.6 Most suitable applications of NiMH and NiZn batteries6.7 Environmental and safety issues with NiMH and NiZn batteries6.8 Potential future developments in NiMH and NiZn batteries for HEVs and battery electric vehicles6.9 Market forces and future trends