leaving radio on when turning off the engine drains the battery

in Hyundai
Leaving radio on when turning off the engine drains the battery, eventhough the radio is off?
Has anyone heard or know of this? What I notice is that if I leave my radio on when I turn off the engine, the next day, the battery is drained and I can't start my car. It sputters and tries to turn over but cannot start. Again, this morning I went out to start my car and it won't start, then I remembered I left the radio on when I turned off my car last night. Finally, it got a kick start and the engine started and my radio began playing. I turned off my radio, turned off the engine, started the car and it started right up.
My sister had same problem in her 2005 Hyundai Tuscon.
Has anyone heard or know of this? What I notice is that if I leave my radio on when I turn off the engine, the next day, the battery is drained and I can't start my car. It sputters and tries to turn over but cannot start. Again, this morning I went out to start my car and it won't start, then I remembered I left the radio on when I turned off my car last night. Finally, it got a kick start and the engine started and my radio began playing. I turned off my radio, turned off the engine, started the car and it started right up.
My sister had same problem in her 2005 Hyundai Tuscon.
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Comments
tidester, host
SUVs and Smart Shopper
Whenever you turn off the IGNITION to the car, the normal radio would go to SLEEP and uses very little power (<1mA in SLEEP mode vs. 2A in OPERATING mode).
So assuming your battery has 200 Amp Hour capacity or 200,000 mA hour. It would take 200,000 hours for the battery to be drained by the radio in SLEEP mode. That is about 347 days.
Now if the radio is not going to SLEEP and stays in OPERATING mode with IGNITION off, it would draws 2A. Then the battery will be gone in 100 hours which is less than a week
But there are many electrical modules inside the car which also draw battery power. Any of them, if not working properly could drain the battery.
Another thing: for people who only drive 2-3 miles each day, then the battery may not be recharged enough and eventually it would lose its energy. In that case, take the vehicle out for a long distant driving once in awhile to replenish the battery, lubricate the system,...
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jt