Every reason not to do it. The car battery will soon be destroyed from using it as a deep cycle. The plates simply will not hold up. Amp capacity, charging characteristics, discharge characteristics are all different and when the car battery fails, it will likely take the deep cycle battery with it soon afterwards.
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2011 Outback 277RL
2013 F250 XLT Crew Cab 6.2L
Bitter Gun Owner
Bitter Clinger
Armed Infidel
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