nickel hydroxide

powdered iron and ferrous hydroxide

21% solution of caustic potash

all the above stated materials

its e.m.f. remains constant

water is neither formed nor absorbed

corrosive fumes are produced

nickel-hydroxide remains unsplit

equal to the battery nominal voltage

twice the battery nominal voltage

2.3 to 2.5 V per cell

half the nominal voltage of the battery

initial charge

freshening charge

boost charge

float charge

dead battery

battery in danger of becoming over-discharged during a working shift

fully charged battery

completely discharged battery