I've just ordered a new battery for it. The existing one seems to be on the way out. It doesn't seem to want to hold charge for very long. There are some interesting symptoms though. When charged, it will spin the engine over fairly briskly but my TD5 will not start. Even with the assistance of the start boost function on my battery charger, it won't go, or even cough. However, I've just tried it on a known good battery and it started straight away. It just shows the TD5 is pretty sensitive to battery condition.
I can't complain, as it's lasted since mid 2016. I was a bit apprehensive because everything is so expensive these days, but I've actually paid less in 2023 than I did in 2016, just over £100 for 120 amp hours and 1000 CCA. In fact I think my last one was a bit less powerful, at 100Ah and 900 CCA for £130.