Battery replacement is the process of removing an old or depleted battery from a device and installing a new one. This is commonly needed for devices like smartphones, laptops, and remote controls when they no longer hold a charge. The replacement can often be done by the user or may require professional assistance, depending on the device's design. To replace a battery, first, ensure the device is powered off and unplugged. Then, carefully open the battery compartment, remove the old battery, and insert the new one, making sure to align the terminals correctly. After securing the compartment, the device should be ready for use again.