Power supply
Most technology requires a power supply. Common power supplies include batteries and generators.[citation needed]
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Batteries
Batteries are specially crafted cells, often portable, that store power over extended periods of time in a stable physical form. This allows a technological item to be consume energy as needed. Batteries have limited capacities and must be recharged once spent.[citation needed]
Generators
Generators continually produce power, either by consuming fuel or converting other forms of ambient power. Such power conversion makes generators dependent on being near a fuel source or too cumbersome to be easily moved. While a generator with sufficient fuel doesn't run out of power when used, it does have a maximum output capacity that might prevent other connected technology to fail if that limit is exceeded.[citation needed]