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Old bateries are not like old faithful
When a battery gets more than 3 years old, it is probably time to replace it. Boat batteries just can't take the abouse a boat setup gives. Go to your local big box store and look at the warranties on the batteries for cars. Many will give you a free replacement for 36 months and a prorate for up to 72 months.
Now look at the marine starting batteries. Most have a 12 month warranty with some giving an additional 12 months with a pro rate. As far as Deep Cycle batteries, 12 months is about it. Also, I have been told by many battery stores that there is no accurate way to test a deep cycle battery.
I use the calendar to change my batteries and if I have any problems before the 3 years, I just bite the bullet and buy a new one. BEING STRANDED IN THE WATER IS NOT FUN AND CAN BE VERY EXPENSIVE.
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