Just replaced battery on my 97 ,it was put in my car by original owner in 07. I bought car in 08 and always used a smart charger . 13 years old still had 12.7 open circuit voltage after sitting for almost a week ,specific gravity was 1.260 and i never had to add water . It was a Acura 100 month group 35 battery , I replaced it with a Deka Ultimate 735 MF only because how long you want out a battery .