Publisher Summary This chapter discusses several types of silver batteries, such as silver oxide-zinc primary batteries, silver-zinc secondary batteries, and silver-cadmium secondary batteries. There are two types of silver oxide cell: one has a cathode of monovalent silver oxide (Ag20) and the other type uses divalent silver oxide (AGO). The latter type has a higher theoretical potential (1.8 V) and, because there is an additional chemical reduction from AgO to Ag2O, it has a higher capacity. The silver oxide battery consists of a depolarizing silver oxide cathode, a zinc anode of high surface area and a highly alkaline electrolyte. Silver-zinc secondary batteries are leakproof, spillproof and have high impact strength. The assembled cells can be enclosed in sturdy lightweight cases for special mechanical and environmental conditions. Batteries can also be designed and built to meet the most stringent requirements. The design of silver-cadmium secondary batteries is very similar to that of the silver-zinc battery, with the exception that the zinc negative electrode is replaced by one fabricated from cadmium..