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If I remember correctly head lights are 55 to 65 watts each, ecu is around 60 watts, another 60 watts of misc bulbs comes to 250 watts or 20.8 amps drawing of what in the case of my civic is a 45amp hour battery that is designed to power the starter that is nearly 120 amps for up to 10 seconds (large draws are harder on the battery then smaller loads) and my longest engine off coast was exactly 2 miles lasting nearly 3 minutes, 3 minutes with a 20 amp load on my battery is not something I would worry about unless I was to stop and park my car at the end, every single time.
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