What kind of battery is used in a laptop computer and mobile phone ? a) Li ion battery b) Dry cell battery c) Fuel cell battery d) Simple cell battery

{
  "answer": {
    "type": "explanation",
    "text": "Laptop computers and mobile phones use **Li-ion (lithium-ion) batteries** as their primary power source. These batteries are preferred due to their high energy density, lightweight design, and ability to recharge multiple times. Li-ion batteries provide a long lifespan, stable voltage output, and efficient energy storage, making them ideal for portable electronic devices. Unlike dry cells (e.g., alkaline batteries) or simple cells (e.g., Daniel cells), Li-ion batteries are rechargeable and offer superior performance in compact devices. Fuel cells, while efficient, are not practical for consumer electronics due to their size, complexity, and need for continuous fuel supply."
  }
}