The battery world is really a small place. There are only 2 mfg's of battery lead in the world and a handful of battery builders. Volvo does not make their battery, nor does interstate. Exide (Yuasa), GNB, C+D, East Penn, and Trojan are some of the leading mfg,s.
Technology has come a long way. Batteries should last you 2-10 years depending on conditions, use and care. They do not like being over-discharged. Run them flat and it seriously reduces their lifepan. They do not like the cold. They do not like the heat either so depending on where you are has a large bearing on battery life.
I live in Canada I see temp swings from -30C to +35C. My 99 has the original, My 98 was changed this year. My 91 is on its second.
If your battery is working and gives you a strong start why change it?
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73 ES, 91 240, 98 S90
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