Replacement Battery 2005 x5 3.0d

[powers1]

Originally Posted by 318i318is328i645i745ix5

thank Yii. Appreciate the quick response.... however living in Poland, Europe we dont come across names like Optima, Douglas etc...

What about Bosch or Varta ?

Here is what i have learnt so far from the forum:

1) From what i gather the specs need to match exactly ?? So for the x5 3.0d 2005 the battery i need the equivalent of the below:

a) Original BMW battery, filled 90ah part number 61218381768 or
b) Original BMW AGM-battery 90ah part number 61216924023

can anyone confirm this ? Whats the difference between a&b in real pratical terms?

3) Then if i was to buy an alternative it would need to be the same specs:
12 V / 90AH / 720A

can someone confirm this ?

4) In that case would the following Bosch or Varta with same specs be ok...?

BOSCH BATTERY 90Ah 720A S3
S3013 / 017 BOSCH Car Battery 12V 90Ah Bosch Car Batteries Free 24hr UK Delivery

or

VARTA BATTERY 90Ah 720A
Type 017 Varta Black Dynamic Car Battery 12V 90Ah (Short Code: F6) (Varta DIN: 590 122 072)

5) I also read something about an air vent...? does anyone know if the above have an air vent ? If not then should i not use them?

6) Any other recommendations would be much appreciated...

cheers all!!!

You can buy any 90AH 720a or higher for your 3.0D as long as its the right size and has a left positive(+ ).
I bought mine from Bmw dealer with a bit of a discount and worked out cheaper than buying other brands.So,they are all good ,its just a matter of getting the best price for you.
My oem battery was made for BMW by Varta ,so you may find that Varta aftermarket replacement would be ideal as Varta make some of the best batteries .

Difference between A and B is that the AGM battery is the new technology and far superior and will cost twice as much as the oem standard lead-acid.AGM is a new technology even better that Gel as it doest need any special battery chargers and charges like a nornal lead-acid battery.

AGM technology delivers increased safety, performance, and service life over all other existing sealed battery types, including gel technology. In AGM sealed batteries, the acid is absorbed between the plates and immobilized by a very fine fiberglass mat. No silica gel is necessary. This glass mat absorbs and immobilizes the acid while still keeping the acid available to the plates. This allows a fast reaction between acid and plate material.