[masraum]

Originally Posted by dad911

$25 insurance. I use this to check the boat batteries:

https://a.co/d/8Urjzqc

I've considered getting a load tester for batteries. The prices are reasonable these days with 50 cheap Chinese options on the big-A but even the Schumacher BT-100 (basically the same thing that I used at the FLAPS in the early 90s) is <$45 on the big A. (still probably made in China, but at least it's a company based in the US, that's been around for decades.)

Originally Posted by rfuerst911sc

I tried Tractor Supply batteries in the Boxster . Standard lead acid . First one was replaced under warranty at 2 years old . The replacement battery is starting to go bad in a little over a year . Always on a maintainer . Puked some acid on the maintainer . Never again I will keep using Walmart AGM batteries .

After my experience with AGM in the miata and now the boxster, I can't imagine why I'd ever buy anything else. They last longer and seem less likely to become a major problem (need to add water, need to worry about acid leaking, exploding, etc....) like a regular lead-acid.

If you can find an AGM for your application, go for that!