Power consumption is another factor to consider when recommending and implementing a computer-based AAC system. Notebook computers have sufficient battery life to operate for approximately 2-3 hours, depending on the model. This is usually not enough to enable the user to communicate for an entire work day. This limitation in battery capacity may require assistance from others in changing the battery or connecting the computer to an electrical outlet. Alternative power sources may be implemented to provide the user with the necessary power to communicate for longer hours.
Some commercial products utilize the batteries of a power wheelchair to power the computer.
In addition, these battery adapters can provide power to other hardware components like external synthesizers, external CD-ROM drives, etc. In conclusion, there are many steps to evaluating and implementing a computer-based AAC system with the active adult. During the initial needs assessment, device characteristics are determined based on the individual's abilities, goals and expectations. Through a comprehensive evaluation, the individual may demonstrate the potential to utilize computer-based AAC technology. Determining the most appropriate access method will predict some of the hardware and software requirements of the system.