Knowing what I now know, I'd encourage you to do something to bring the charge up to spec. My driving is similar to yours, and although everything was fine for 2 1/2 years, as you can read from my posts, once that battery actually kicks it, bad things can happen.
Another thing I neglected to mention but that I've seen posted...my service rep told me "it wouldn't have done me any good to buy a battery on my own since it would have had to have been reprogrammed". This doesn't make any sense to me. Sure, perhaps I might have lost certain settings, but any techs on here who can speak to this?