My 1999 Curvy came with a Dynavolt Sealed gel Battery which is over 3 years old and no problemss,
https://www.ebay.co.uk/itm/SUZUKI-SV...gAAOSwQN5afbMR
When it goes I like and have used MotoBatt full AGM batteries and have one in my kitchen from and old Motorcycle that is over 6 years old and still fully functional.
I will most likely go for a Motobatt AGM when the one on my SV goes as they are Fire-And-Forget and come fully charged and sealed,
https://www.ebay.co.uk/itm/Suzuki-SV...EAAOSwHUVa1vzR
HTH
