BATTERY DISPOSAL: Several readers want to know whether the disposal of these batteries will create an environmental problem.
Toyota and Honda say that they will recycle dead batteries and that disposal will pose no toxic hazards. Experts agree.
"Nickel metal hydride batteries are benign. They can be fully recycled," says Ron Cogan, editor of the Green Car Journal.
Rechargeable nickel cadmium or NiCad batteries -- which were commonly used in consumer electronics -- can cause environmental problems, but "they've been replaced by nickel metal hydride," Cogan says.
"The materials inside those batteries are valuable," says Friedman. The car and battery companies have financial incentives to make sure they're recycled, he adds.