SW = software

patch = term used when they recode software to correct something initially released, but now realize there is a better way to do it...etc

In BMW speak, they will have a SIB (service bulletin) that may instruct them to recode the charging system to use a different charging algorithm. I am NOT sure if this will apply to your car, and I didnt bother searching to find it.

Remember, you can always decline to pay them $1000. Have the wife drive you to a store, pick up a battery and pop it in at the dealers lot. Did you sign a WO with anything other than $0 where it says 'estimate'??? Technically they need your approval BEFORE they do any work that would increase that past the approved amount.

GL

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