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To add to Chowsers comment easiest way to know is have someone check fault codes with ISTA as low voltage from the battery is always logged as a fault.
Another sure sign is when certain things switch off when they previously worked immediately.
Example welcome light not on, I drive screen won't switch on until engine starts, interior light etc.
The car limits services when voltage is low to ensure you can start and run minimal required modules to start.
QUOTE=chowser51;28296080]You live in an area where it gets cold. Your battery is over 5 years old. Get it load tested to make a determination. I've never had a battery survive over 4 years.[/QUOTE]
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