Quote:
Originally Posted by alee0729
BMW doesn't make the battery. They just put their label on Exide batteries. It's not anything special.
As long as you have enough power to start the car from cold, the battery doesn't do much other than being a buffer for power demands while the car engine (and alternator) are running.
If you drive every day, you can get away with a smaller battery as long as it has enough CCA (cold cranking amps) to get the V8 fired up. OE spec is 850 CCA.
If you drive infrequently, you'll need a battery that can tolerate deep cycle charges (e.g. AGM). Lithium is popular because the power output is linear - regular batteries are basically useless below 50% charge, but a lithium will still start you at 20%. More amp-hours gives you more time between drives.
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What about the deep cycles batteries like the Yellow Top?
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