Reading this makes me think I should replace my battery sooner rather than later. However, everyone here should know, many batteries go for 200,000 miles or more and currently only cost about $4k to fix. Not much more than some dealer transmission or full engine jobs. Repairs are expensive, no matter what propulsion you use.
This is why I have been driving VW diesels since 1980. Have always averaged in the mid to high 40’s MPG with an automatic (50+ with manual), have always given me around 350,000 miles of car life, and have been relatively trouble-free. I use to drive about 50,000+ high speed miles per year. I’m now on my fourth VW TDI, a 2000 Jetta with 225,000 miles on it. Going strong! Who needs a fancy battery?