BS EN 61056-2:1997 Portable lead-acid cells and batteries (valve-regulated types. Part 2. Dimensions, terminals and markings
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This part of IEC 1056 is applicable to lead-acid batteries of the valve-regulated type for cyclic and stand-by application with the rated capacity not exceeding 25 Ah. The cells of this kind of lead-acid batteries may either have flat-plate electrodes in prismatic containers or may have spirally wound electrodes in cylindrical containers. The electrolyte in these cells is immobilized either by absorption in a microporous material or in gelled form.