Originally Posted by
zip439
The way most retail batteries are made these days I would not trust any over 30 months. You are doing well if you can get through a winter at 36 months. You can pay more like Optima, but they do not give you much either; Check their warranty.
Look at the manufacture date on the side of the battery, batteries on sale are older batteries and maybe half their life has gone already.
Get a fresh battery from a good manufacturer with a good warranty. Heavy batteries have more power, more weight = more power.