check the acid level with a lighted match

short-circuit the cell terminals to see that they are fully charged

keep them in a well ventilated room

connect and disconnect them with the D.C. source

its electrolyte is sulphuric

it is a wet cell

its chemical action is reversible

its electrolyte has a high specific gravity

12 h

8 h

20 h

100 h

overcharge the battery

clean the plates with distilled water

remove the electrolyte

remove electrolyte and dry up the battery and store the same in a cool, dry and clean place

Ni - Cd

Ni - Fe

Alkaline magnesium

Lead-acid