I was reading a preview of the new Toyota Prius 7 seater which uses a more advanced lithium-ion battery pack in lieu of the nickel-metal hydride unit and it says"
"The technology, which is used on the Chevrolet Volt and Nissan Leaf, packs more punch in a small package - Toyota says the new lithium-ion battery pack is half the size but pushes out the same amount of power, and is seven kilograms lighter than a NiMH pack, at 34kg.Overall, the Prius V is 135kg heavier than the regular Prius hatch."
I wonder if Lexus will offer a battery pack upgrade to the new lithium-ion for our RX400H. Not that they are cheap but for those who need to replace the battery, it would be nice to get the newer tech.