To escape the gas freely

To allow oxygen enter inside

To check the level of electrolyte

To check the colour changes in the plates

Rectifier method

Trickle charging method

Constant current method

Constant potential method

Changing with new electrolyte

Replacing with new electrodes

Recharging the battery for a longer period at low current

Recharging the battery for short period at high current

Zinc

Copper

Carbon

Silver oxide

0.001182 mg/coulomb

0.01182 mg/coulomb

0.1182 mg/coulomb

1.1182 mg/coulomb