Batteries Rechargeable (Secondary)Rechargeable batteries, also known as secondary batteries, are batteries that can be recharged and used multiple times. Unlike primary batteries, which are disposable and cannot be recharged, rechargeable batteries can be recharged using a battery charger. Rechargeable batteries are commonly used in a wide range of applications, including portable electronics, electric vehicles, and renewable energy systems. They are often preferred over primary batteries because they are more environmentally friendly and can save money in the long run. There are many different types of rechargeable batteries available, including nickel-cadmium (NiCd), nickel-metal hydride (NiMH), and lithium-ion (Li-ion) batteries.