• Definition: A wet cell battery contains a liquid electrolyte (usually sulfuric acid) that facilitates the flow of electricity.
• Examples: Lead-acid car batteries, marine batteries.
• Advantages:
  • Can supply high current
  • Rechargeable (in the case of lead-acid batteries)
• Disadvantages:
  • Requires maintenance (checking and refilling electrolyte)
  • Can leak or spill if not handled properly

2. Dry Cell Battery

• Definition: A dry cell battery contains a paste-like electrolyte, making it spill-proof and more portable.
• Examples: AA, AAA, C, D, and 9V alkaline batteries.
• Advantages:
  • Compact and portable
  • Leak-resistant compared to wet cell batteries
  • No need for maintenance
• Disadvantages:
  • Usually non-rechargeable (except some NiMH and NiCd versions)
  • Lower energy storage compared to rechargeable battery types

3. Lithium Battery

• Definition: A lithium battery uses lithium metal as the anode and is usually non-rechargeable.
• Examples: Button cell batteries (used in watches, calculators), some camera batteries.
• Advantages:
  • Long shelf life
  • Lightweight
  • High energy density (more power in a small size)
• Disadvantages:
  • Expensive compared to alkaline batteries
  • Not rechargeable

4. Lithium-Ion (Li-Ion) Battery

• Definition: A rechargeable battery that uses lithium ions moving between the cathode and anode to store and release energy.
• Examples: Smartphone batteries, laptop batteries, power banks, electric vehicle batteries.
• Advantages:
  • Rechargeable and long-lasting
  • High energy density (stores more power than other types of rechargeable batteries)
  • Lightweight compared to lead-acid batteries
• Disadvantages:
  • Can degrade over time (loses capacity after many charge cycles)
  • Expensive compared to traditional rechargeable batteries
  • Risk of overheating or catching fire if damaged

• Wet cell: Liquid electrolyte, used in cars and heavy-duty applications.
• Dry cell: Paste electrolyte, used in household batteries (AA, AAA, 9V).
• Lithium: Lightweight, long-lasting, but non-rechargeable.
• Lithium-Ion: Rechargeable, high energy density, used in modern electronics.