Rule of thumb for as long as…
Rule of thumb for as long as I've been in automotive is 2-3 years for replacement of a 12 voltage battery. The technology of today's 12v battery is the same technology as when it 1st was invented. Running a battery for 5years only proves 1 thing your running(starting )on borrowed time and one day it to will leave you somewhere. Unless you are able to carry a jump box around with you it's almost certain it will leave you somewhere. A lot of people today won't practice basic maintenance and have a drive it till it drops attitude. Out of sight out of mind reality. Your experience is not the norm but the exception..