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| Message: | Supposedly the cabrio battery is vibration-resistant, and it is larger than the standard battery, to compensate for the additional electrical load (must be able to put the top up/down even with the engine off. So that might be what the autozone parts monkeys are referring to. Probably the designation they are referring to on the computer was "cab" or "conv" and they thought that meant the number of cams or something. The weight and location of the battery are important, and supposedly, the wrong weight battery in the back can throw off the balance and/or cause chassis harmonics. Sounds odd, but that is what I have read, and in the auto business, it is not unknown to bolt weights onto a car during post-development to eliminate weird vibration problems (My old Ford pickup has a 25 lb weight bolted to the back of the cab for no apparent reason). The vibration-resistance is probably due to the fact that the cabrio flexes like a pretzle and vibrates more back there than does a sedan or coupe. It is critically important that you get a battery with a vent tube. The other stuff, well, maybe not things you'd notice. But it would be nice if it fit the hole and the hold-down. My neighbor's cabrio has an off-brand battery (probably the smaller model for the sedan and coupe) and it has a vent, and also a wad of foam rubber filling the void left by where the original larger cabrio battery would go. It works fine, and for a 150,000 mile car, probably appropriate for what they want to do with it. They also have a fully manual top, too, so they don't need the extra capacity for the top motor use. I've been using stock BMW batteries because they fit properly and exactly, are not that much more expensive, and they seem to last 6-9 years, which is pretty astonishing. Good Luck. | ||||
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