Abstract: A casing device for use with a portable electronic device to attach a peripheral device to the portable electronic device. The casing device is configured to be mounted onto the portable electronic device in various ways. The casing device is formed with a first device compartment for removably receiving and supporting a portable electronic device. In another example, the casing device can be adapted to fit in a receiving compartment in the portable electronic device. The casing device can also be formed to have an accessory compartment for removably receiving and supporting a peripheral device, such as an external rechargeable battery. Additionally or alternatively, the casing device can be configured to allow the peripheral device to be electrically connected to the portable electronic device for battery charging and/or data transferring operation. The peripheral device is formed as an external battery to supply power to the portable electronic device.

Abstract: A mowing apparatus has at least one support track adapted to be mounted to an area to be maintained and a mowing device adapted to be supported on the at least one support track. The mowing device of the mowing apparatus has a power supply for moving the mowing device along the at least one support track and for operating the mowing device to carry out a mowing operation. The at least one support track of the mowing apparatus is configured to guide the mowing device to move along the at least one support track during a normal mowing operation. A grass maintenance system is also provided and has one or more grass maintenance devices, such as a mowing device.