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