E89 09 30i battery issue

[Otago]

my 09 BMW oem battery was completely dead......
Can anybody advise me with followings:
1. the lifespan of the bmw oem battery
2. should i get replacement from bmw or aftermarket brands (eg. Fiamm)

thanks

[jparnes1]

5 years is in the normal lifespan range. Maybe on the short side but there's a lot of variables (using the roof a lot with the engine off, leaving the car idle for extended periods without a trickle charger, etc).
All batteries must have a vent tube. Make sure if you go aftermarket that it has this. And make sure it has the proper specs.
A new battery has to to registered with the ECU so if BMW doesn't do the install , you or someone else must do this or bring it to BMW. It requires a laptop, cable and software.

[Otago]

Originally Posted by jparnes1

5 years is in the normal lifespan range. Maybe on the short side but there's a lot of variables (using the roof a lot with the engine off, leaving the car idle for extended periods without a trickle charger, etc).
All batteries must have a vent tube. Make sure if you go aftermarket that it has this. And make sure it has the proper specs.
A new battery has to to registered with the ECU so if BMW doesn't do the install , you or someone else must do this or bring it to BMW. It requires a laptop, cable and software.

Thanks bro....what will happen if i installed the aftermarket battery (eg. Fiamm Titanium Plus) without registered with ECU?

[jparnes1]

So as your battery loses strength, the computer recognizes this and draws more power from the battery at start up. If you don't tell the computer there's a new battery, it will continue to do so and your new battery won't last as long.