If you get more then 5 years out of a battery you are doing good. The average life of a battery in a car is 3-5 years. I would expect this to turn into 2 -4 year average as the newer cars/truck of today are loaded with electonic gizmos.

When you buy your replacement battery(whenever that is) Make sure that you buy as many CCA (Cold Cranking Amps) as you can. Typically the top of the line (depending on Case size) is 750 to 900 amps. Some are even hitting 1000.

Here is another tip for you. Every 12 volt battery has 6 cells. Each cell produces 2.1 volts or more. A fully charged battery should have at least 12.5 volts or more. Get yourself a digital Volt ohm meter (Big box stores have them for under $20.00) and check your batter with the ignition off. Six Volt batters have 3 cells and should be 6.3 volts or more.

Brian Moore
1949 3100 5 window Deluxe
"Today is better than yesterday, but not as good as tomorrow"