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Just wondering if anyone sees the cap drains during cold weather. When I turned on my car this afternoon, (car sitting in sub 20 degrees temperature for a day), I heard the capacitor's charging siren then it goes out. Is that normal? Would that actually drain the battery if I leave the car off for a while during these temperature?

 
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Weather that cold definitely puts a strain on the battery during start up but won't drain it. If the battery's draining then you might have a short somewhere but i dunno about this cap siren you speak of my cap doesn't have a siren

 
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your cap will slowly discharge if its disconnected from its power supply or theres a slight short. Did you just notice it when it got cold out?

 
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every capacitor has a temperature range. If it gets too cold or too hot it will stop functioning normally.
When the ones any of us would have get cold they hold less charge and discharge a tiny bit slower. thats about it I think

 
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2 of mine came with volt gauges that make a tone when they get low

 
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It only happens when it gets very cold outside. So that's normal, right?