Old chemists never die; they just fail to react.
Homework:
Read "Consumer Cells & Batteries" p. 403-407 and do p. 408 # 1-8.
Read "Should Ni-Cd Batteries be Banned?" p. 409-410 and do p. 410 # 1-3.
Read "Hydrogen Fuel Cells" p. 411 and do p. 411 # 1-3.