MAINTENANCE-FREE BATTERIES Essentially the same construction as lead batteries Essentially the same construction as lead batteries Uses substances such as calcium, cadmium, and strontium instead of antimony on the plates Uses substances such as calcium, cadmium, and strontium instead of antimony on the plates These substances reduce gassing during the charging cycle These substances reduce gassing during the charging cycle Additionally an expansion or condensing chamber is used to contain the gassing Additionally an expansion or condensing chamber is used to contain the gassing
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