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The current drawn by a vehicle's systems with the ignition off and all modules asleep is the _____.

  • A.cold cranking amps
  • B.self discharge, which is an internal chemical process and continues even when the battery is not connected at all
  • C.parasitic drain
  • D.reserve capacity, which instead expresses how long the battery can supply twenty five amps before falling to 10.5 volts

Answer: C

Typical acceptable figures lie between twenty and fifty milliamps once every module has entered sleep mode. A larger drain flattens the battery over days and is found by working through the fuses. Naming the cost of a choice alongside its benefit is what turns a fact into a design decision. The shared behaviour explains why these belong together and the differences explain why both exist. Working the distinction through on a single concrete case fixes it more firmly than any rule of thumb.

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