Thread: NISSAN PATROL BATTERYS

To any auto sparkys on here,yr info greatfully received.My old patrol getting harder to start,batterys been in about 7 yrs,12 volts batterys running parallel.I have a third battery i carry as a spare for in the back blocks in case something goes wrong or somebody else needs some power.
I took out one battery and fully charged it to 13.2 volts,over 5hrs it dropped to 12.6 where it should stay a lot longer.Over the next 60hrs it only dropped .24 volts=1/4 of a volt.Do you think this battery still ok,or one cell dying out?Il take out other battery and see if it drops about the same time as 1st battery.I did a crank test,batterys dropped to about 9volts for a couple of seconds then went back up to 12.6 at idle.
When truck is running over 800rpm,alternator charging around 14.5 volts, all good.
Truck only gets a short run once a week or so,till i go hunting once or twice a month.
Thanks for yr time in reading this.