It depends on your comfort level working inside those devices. It's not 'user replaceable' but that doesn't mean you can't do it. Check a video of it first to make sure it's not overwhelming. Any cell phone repair shop should have the tools to do it for you. They will likely have to order the battery though, so it's unlikely to be a 1 day thing.You won't be able to do it yourself. It will have to be sent in to replace the battery. If its quite a few years old, you might as well buy a new one.