Dry Cells

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Devices that transform chemical energy into electric energy (direct current); they usually cannot be recharged

and the electrolyte is fixed in place. porous = having minute(=very small) spaces or holes through which liquid or air may pass seal = fasten or close securely or apply a non-porous coating to (a surface) to make it impervious(=not allowing fluid to pass through) casing = a cover or shell that protects or encloses something manganese dioxide = MnO2 ammonium chloride = NH4Cl augment [ɔːɡˈmɛnt] = make smth greater by adding to it; increase. receptacle = a hollow object used to contain smth
EFL subset that concentrates more on language in context than on grammar and language structures. It covers topics from accounting or computer science to tourism and business management. "Specific" means the studying through a field that is already known and relevant to a student.