I think my battery is on its way out, and having searched on the internet I am a bit confused regarding which battery can replace the OEM one I currently have.
Currently I have Original BMW Battery (filled, not AGM) with part number 61218376451.
I have read that the battery in the convertible is some form of mass damper , so it is a "special anti-vibration" battery. Is this true? I have seen claims but nothing that actually confirms it.
I also read in US forums that the Duralast 92R-DLG is a direct swap. In the UK, I have found the following batteries are being suggested:
- BOSCH S5010 - 5 Year Guarantee Battery
- F18 Varta Silver Dynamic Car Battery (which apparently is the same as the Bosch above)
Would anyone suggest anything else?
If the mass-damper issue is true, would the above batteries be up for the job?