Ever wondered how that calculator or wall clock works? It's like MAGIC but it's SCIENCE! Dive into the mysterious world of cells (not the biology ones)!

• What is it? It's a magical box that converts chemical reactions into electricity.
• Used in: Tiny torches, old-school fire alarms, calculators, and wall clocks.
• What's inside? Scary stuff like zinc metal, manganese dioxide, and potassium hydroxide which are harmful to us and Earth. 🌍
• Can it be used again? Nope! Once used, it's done!

🚗 Real-world example: Ever leave a flashlight on too long and then it goes dark? That’s because of the primary cell inside getting exhausted.

• What's different? Unlike its older cousin, the primary cell, this one can regenerate. It's rechargeable!
• Environment? Better than primary cells, but there are still some concerns.
• Examples? The classic lead–acid battery (like in most cars) and the lithium-ion batteries (used in cool electric vehicles).

💡 Did you know? Electric cars, like those made by Tesla, run on giant lithium-ion batteries!

However, just like how ice cream can melt if you don't eat it fast enough, these batteries can overheat. And over time, they won't charge as well (imagine your phone battery after a year or two).