You are getting all the correct information here. What I will add is, when replacing batteries, not all are the same. You'll get what you pay for. A high quality set should get you 5-6 years of service. I've had some Trojan T105's going over 6 years with everyday use. There are equivalent brands, I'm just making statements from what I've experienced.
This is ONLY to be used to report flooding, spam, advertising and problematic (harassing, abusive or crude) posts.