Newer BMW M3 batteries cost $1900?

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I'm curious about that. I have a lithium in my bike, had it for probably 6 years now. Never gave me grief, no signs of imminent death, even after sitting for well over 6 months untouched.
And you charge it like it's an AGM? If there's a charge controller included there's no issue, you just feed it 14V or so and the charge controller does the rest.

I have no idea if the BMW has an external controller or internal but there has to be one somewhere in the loop.
 
One thing missing here is that most if not effectively all first owners of new BMW's and similar premium vehicles do take their cars to the dealerships for batteries, tires, etc. Why? Because it is easy, makes sense, and the dealerships make it a relatively painless experience. The person who buys a recent M3 is probably not sitting at their desk researching what batteries will substitute for OE; if they need one they book an appointment online, show up (or their car gets picked up) and have a nice similar loaner waiting. Then they happily pay the bill with the premium not mattering, because it is worth it to them. I do it with my DD...

So for BMW (or MB, Rover, Porsche...), the trick battery can be specified for whatever reasons they determine (weight, power??) knowing that it really doesn't matter to their customer base
 
It's a Lithium battery.

Think it'll be a while before one needs replaced. The 3rd or 4th owner will probably just opt for an AGM.
6 or 7 years and it'll be time for a new one if the car sees regular use. LiFePo4 doesn't really buy you anything in terms of cycles that are less than 20% DoD, and a starting battery is not likely to get below 80% as it remains basically full all the time, except for the 3 seconds it takes to turn the starter motor. Whoever builds the batter will have the cycle specs on their website.
For 5% of the money, you could buy a deep cycle interstate or Penn Deka and get just as good of a lifespan.
Seems like a really expensive way to save 50 Lbs of weight on the car
 
6 or 7 years and it'll be time for a new one if the car sees regular use. LiFePo4 doesn't really buy you anything in terms of cycles that are less than 20% DoD, and a starting battery is not likely to get below 80% as it remains basically full all the time, except for the 3 seconds it takes to turn the starter motor. Whoever builds the batter will have the cycle specs on their website.
For 5% of the money, you could buy a deep cycle interstate or Penn Deka and get just as good of a lifespan.
Seems like a really expensive way to save 50 Lbs of weight on the car
It is the incremental 50lbs vs. ever tightening CAFE regs....
 
car maker wanted to save 50lbs of weight with no consequences. they got it done. the end
They could also mandate that you can't be morbidly obese and be able to buy one, much better than mining rare Earth elements to shave 1.5% of the total vehicle weight.
 
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