How long your battery will live depends upon a number of factors -- its quality, what you use it for, what kind of care and maintenance you give it (including charging rates), etc.
I've had 2 6V Trojans in there since '08 - that's 7 years and they show no signs of packing it in. But like Javi said, maybe they are living on borrowed time.
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2008 Cougar 5th Wheel 27RKS
2005 2500 GMC Duramax
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