Quote:
Originally Posted by MLSavage
Do these light weight batteries last as long as OEM (regular) batteries?
In short, is there any catch to switching my 135 (or even 325) to this lightweight battery? Any negatives?
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There is a reason why BMW uses such a large battery in the 1 and 3 series, for reserve capacity and cold cranking amps. With a smaller battery you will see both of those reduced. However, if you are careful not to run your electrical consumers for hours and don't do a bunch of short 1-2 mile trips, the 21 lb. battery is very good for daily use.
I have done a personal test on a 2011 135i by letting the radio run for a couple of hours, no issues there. Park the car for over 2 weeks, it started right up.