I don't know of any mobile battery services... But if you want to DIY it's super easy. There'll be one bolt holding down a plastic thingy that is holding down the battery. You'll probably need a ratchet with an extension to get to it. It'll be easy to see, but down at the base of the battery with not much space to get your hand down there. You don't have to take this thing all the way off, just loosen it enough that you can jiggle the battery out.
Other than that, the only thing holding your battery in your car are the two post connections.
If they're top post, a 1/2" wrench or a crescent wrench will get them out easily.
Side posts will probably require a ~3/8 socket to remove.
Remember that the only "power" a car has comes from the battery, so once you disconnect one of the posts, there is no way to "blow yourself up". Just be careful not to ground the wrench while loosening the positive connector. That's about the only thing that can go wrong. And even that will just be a few sparks.
The most important thing about battery replacement is cleaning the posts when installing the new battery. There is a tool you can buy for ~$5.00 that has a wire brush in the handle and a female wire brush for top posts. Scrape those posts and scrape the connectors on your car until they're rough and shiny.
Attach your connectors and tighten snugly, but don't go Hercules on them. If they're lead top post connectors, they'll crack and you'll have another hour of work replacing those.
Only other thing to keep in mind when replacing the battery is at the purchase counter... You need to buy a battery that is physically similar to the one in your car. There aren't that many choices and the guy at the counter will probably know, based on what car you're doing it for.
Try it, man! It's sooo easy. It really is 95% logic. Once you're looking at it, it's pretty obvious what to do. You'll be a hero for a day and you'll save at least a hundred bucks...
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