2020 BMW X3 M40i Battery Replacement.

This works on all BMW X3 models at least. Could be similar on X5 and X7.

This is me in real time figuring out the hard way how to change the battery.
It still took me only 30 minutes total to do it by myself.
You can save yourself a lot of money just swapping it out and not paying any mechanics.
Once you know how to replace it it would take you maybe 15 minutes. Any mechanic no more than 10.
But the labor for doing it yourself is FREE.

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