State four disadvantages of lead lanche dry cells?

1. Environmental impact: Lead is a toxic material that can have harmful effects on the environment if not disposed of properly. Improper disposal of lead-acid batteries can lead to soil and water contamination.

2. Weight: Lead-acid batteries are heavy and bulky, making them less convenient for portable devices or applications where weight is a concern.

3. Limited lifespan: Lead-acid batteries have a limited number of charge-discharge cycles compared to other types of batteries, which can result in shorter overall lifespan and more frequent replacements.

4. Maintenance requirements: Lead-acid batteries require regular maintenance, such as checking electrolyte levels and ensuring proper ventilation, which can be time-consuming and costly.