38) is preferred but at higher
concentrations of H2SO4, reaction (2 39) is preferred Any battery (actually it may have one or more than one cell connected
in series) or cell that we use as a source of electrical energy is basically
a galvanic cell where the chemical energy of the redox reaction is
converted into electrical energy However, for a battery to be of practical
use it should be reasonably light, compact and its voltage should not
vary appreciably during its use