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I am used to modern aircraft being 28V systems. I found an article saying that a trolley AC plug in battery used to start WWII aircraft was 12V. I'm trying to confirm or disprove this.
This aircraft museum says that the "Trolley Acc" (Trolley Accumulator) used for Spitfires and other aircraft supplied 12 volts. Lots of sources state that Spitfires had 12 volt electrical systems, including the Pilot's Manual.