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Batteries are critical components in cellular telephone systems. In the remote, unmanned, and sometimes hostile environment that the majority of the carrier equipment is deployed, batteries are depended upon to provide reserve power on demand. All too often, the selection, installation and maintenance of these components are handled by telecommunications professionals who are not knowledgeable about batteries or charging equipment. On the other hand, the battery suppliers, insta1lers, and maintainers may be unfamiliar with the ce1lular telephone environment. It is the intention of this paper to be of assistance to all of those involved in the selection, installation, and maintenance process. In keeping with the ce1lular industry's battery of choice, only the Valve-Regulated Lead-Acid (VRLA) battery will be discussed.