Q. Consider the following:

1. Lithium-ion battery
2. Nickel-metal hydride battery
3. Lead-acid battery

Which of the above is/are considered rechargeable batteries?
Answer: Only 1 & 2
Notes: 1. Lithium-ion batteries are widely used in electronics and electric vehicles due to their high energy density and low self-discharge rate. They have a long cycle life and are lightweight. 2. Nickel-metal hydride batteries are commonly used in hybrid vehicles and portable electronics. They have a higher capacity than older technologies and are less toxic than lead-acid batteries. 3. Lead-acid batteries are primarily used in automotive applications and for backup power. While they can be recharged, they are heavier and have a shorter lifespan compared to lithium-ion and nickel-metal hydride batteries.