Not registering the battery can lead to a shortened life. The car starts using a higher voltage when charging an older battery, and if the battery is not "old" this higher voltage will shorten its life.
Exposure to very high or very low temps also shorten the life of a battery. So does letting the battery go completely flat - this really shortens the life.
I find it hard to believe the previous dealer did not register the battery when installing it since they make such a big deal about needing to register.
ISTA/P is BMWs programming software.
Straight lines are for fast cars...turns are for fast drivers
'04 M3 - track
'06 650i Cab - daily driver
'02 Highlander - kid hauler
'01 330Ci - winter beater
Last edited by Yorgi; 10-11-2012 at 06:57 PM.