Thread: D2a TD5 Auto Cranking Battery

I purchased a D31A yellow top as an aux battery for an outback trip. On return it has had various duties from sitting without a maintenance charger for 18 months and then as a starter battery in a D2a. While in the D2 it was drained down to the stage where it would not crank the car. Put on a charger and all good once again. After 16 years it finally had a cell go bad as it got hot while on a charger. I would have no problem, other than the cost, with using an Optima Yellow Top D31A as a starting battery on a D2.

Thanks to everyone who took the time to post their thoughts in reply to my initial question.

Some posts have reminded me of certain domestic conversations, in that I seem to have stimulated argument that I wasn't looking for and didn't expect!
They also show that there is a lot of accumulated experience and knowledge on this forum (as well as some strong opinions!)

In the end, I went for a conventional "flooded"-cell 1000 CCA cranking battery.
120 Ah and RC 205 minutes.
The previous one was coming up for 4 years old, and was getting pretty "doughy" if the car had not been used for 5 days or more.

Also decided to replace my 6-years-old Auxiliary AGM battery with a deep-cycle 90 Ah AGM.
This is mounted lying on its side, terminals uppermost, on the SLS air-compressor shelf that is otherwise vacant on my vehicle.
Picture attached.

My cranking battery is in the standard location, so I was reminded to check the red injector-loom plug on the ECU.
It had been 4 years since I did this, and I found a fair bit of oil to clean out with contact cleaner.
Another job done!