Which maintenance check is NOT necessary for battery power units?

Checking the machine weight is not necessary for battery power units because the weight of the machine does not typically affect its performance or functionality in the same way that other maintenance checks do. The focus in maintenance for battery-powered units is usually on aspects directly related to the operation and safety of the equipment, like ensuring the battery is secure and undamaged, inspecting components like guide tracks that influence mobility and cutting capability, and maintaining user interfaces such as the keypad. These checks ensure that the machine operates effectively, safely, and without interruption, which is crucial for battery-powered equipment that may be subject to different conditions compared to traditional fuel-operated tools.