I used the Internet before, but had to replace again after 3-4 years. Same excellent explanations. Thank you, and to make your public service even more available, here are the links for future battery-replacers. I have one piece of advice to add: hold onto your tools carefully…. if they fall into the battery well after you have replaced everything… well, you have to under the entire apparatus to retrieve the socket wrench. Not saying it happened to me.

Opening trunk is first mystery when battery is dead.
Excellent instructions.
And video: