alkaline batteries only

alkaline and solar batteries

alkaline and dry batteries

nickel-cadmium and nickel-iron batteries

water to hydrochloric acid

sulphuric acid to water

hydrochloric acid to water

water to sulphuric acid

the thickness of plates

the distance between the plates

the number and area of plates

the strength of electrolyte

clean the terminals frequently

change the battery at frequent intervals

clean the terminals and to apply petroleum jelly

wash the terminals with water frequently

is high

is low

remains same

is negative