Run it till it dies and keep a jump box in the trunk for when it does.
Exactly what I've done. And not long ago ~7year old AC Silver died. Put this
GooLoo jumper on 3.0L Accord, worked like a champ. My better half amazed how easy to hook up and how well it worked. I hadn't charged it in quite awhile and had 3 out of 4 bars. Just as a test, when car got home tried again, worked again. I got the jumper early last year on an Amazon deal, <$35.
That said, may not be the best option for everyone but I'm sold.