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A battery is made up of 6 cells. Typically, one cell goes bad (shorts out). And I agree, 7 years is long enough for most batteries.
You do not need to go to a dealer for a battery. I think BMW wanted 500-600 to replace the one on the X5. I think the OEM was Bosch and Pep Boys replaced it $120-140. I was going to replace it myself, but it was included in the battery price.
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James
The pessimist complains about the wind; the optimist expects it to change; the engineer adjusts the sails.- William Arthur Ward (1921-1994)
Red-beard for President, 2020
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