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I have a 2008 Challenger srt8 and the battery goes dead if the car sits for 5 or 6 days. Anyone else have this problem and what was the fix ?
 

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If you lock the car, it activates the security system on the car, increases electrical load on battery. Its small but over time it will drag a battery down, every time. If you have the car in a locked garage, don't lock it. That will reduce parasitic amperage draw. If you lock it, put a trickle charger on it.( if you store it for weeks at a time, I'd put a trickle charger on it.)
They do help extend battery life.
 

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If you lock the car, it activates the security system on the car, increases electrical load on battery. Its small but over time it will drag a battery down, every time. If you have the car in a locked garage, don't lock it. That will reduce parasitic amperage draw. If you lock it, put a trickle charger on it.( if you store it for weeks at a time, I'd put a trickle charger on it.)
They do help extend battery life.
With some cars not locking the car keeps the car's electrical system "alive" far longer and at a higher draw than locking the car. Locking the car "signals" to the car's electronics the car is not going to be used again for a while so the electronic/electrical systems power down promptly.

For the security system while it is "on" it is only only part of the time. And if the car sits some time -- with a previous car it was 5 days -- the security system goes into a power save mode -- and one can't even unlock the doors by pushing a button on the key but have to use the blade to open the driver's door.
 

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You need a battery tender.
 

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You are not running a Tazer or Diablo Sport tuner by any chance? Could also be the battery itself. Have you disconnected it, let it sit and the reconnect to see if it holds a charge?
 

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My instance of similar was bad door lock/actuator, which showed up as several amp battery drain before failing to move the window for opening/closing the door.
 

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Put a battery tender on it. battery is probably over ten years old. Mine sits too, so I have a Northern tool battery tender on it 24x7 during the winter. No issues.
 

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10 year old AGM battery...that is well over its intended service life. I bet you load test it, it will fail spec.
 
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