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The valve opens when the cell's internal pressure exceeds a set limit and once the pressure is relieved the valve closes and reseals. No cell check of an electrolyte level nor the specific gravity of each cell is required. These batteries are not maintenance-free as some 10 or more maintenance checks are still necessary. Outgassing of these batteries is low at normal charge rates, but it can occur when there is a battery or battery charger failure. Cells can pose a hazard if enclosed so as to inhibit cooling air, or installed so as to place them in the heat flow of electronics which may occupy the same enclosure.

14-3. Battery safety.

Safety precautions cannot be ignored, since every station battery installation presents hazards. The importance of using safety equipment, such as rubber gloves, goggles, aprons, and of having an eyewash water bottle present, cannot be overemphasized. The three major hazards are from the electrolyte in the battery, the gases emitted by the battery, and the potential electrical short circuit capability available from the battery's stored energy. Most persons trained to work in an electrical environment are aware that batteries are dangerous, but need to be warned and advised again as to the extent of the hazards posed by all station battery systems, regardless of size or type.

14-1

TM 5-684/NAVFAC MO-200/AFJMAN 32-1082

a. Warnings. All batteries contain an electrolyte which may be liquid and is corrosive. Lead-acid batteries contain diluted sulfuric acid and nickel-cadmium batteries contain potassium hydroxide.

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