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They also can work, but are not as dependable as a proper power supply as the battery starts off at a lower voltage (9V), and the battery can weaken due to age, resulting in the same issues as not having anything. Some OEM systems also do not hold their settings very well at 9V. For a "one off" battery swap, they can work; but for a shop, or if one is about to buy a new maintainer, looking for one that can do a proper "supply mode" is a good investment as they will work on any car.
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“Anything really new is invented only in one’s youth. Later, one becomes more experienced, more famous – and more stupid.” - Albert Einstein
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