@Juicer It sounds like you want to have your cake and eat it, too. You may use a car battery. But you may use something else. And regardless of its chemistry or topped off voltage (for example, \$12.6+ \:\text{V}\$ for lead-acid car battery or other voltages for other chemistries) you want it to magically provide the (6) AA battery curve used by the device to "determine the battery level." I will enjoy seeing what someone comes up with, if that's the goal. Kind of a swiss-army knife to accept input sources. Cool.
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