Battery followup... Sarah bought a set of new "EverStart" maintenance-free batteries from Wal-Mart when the 6.5TD Blazer project was nearing completion in the fall of 2021. Aside from labeling, these look exactly like the NAPA versions I used for my 2001 GMC. Thus far, the Blazer has gone through 2 full years with its new batteries and about 3k miles of driving. The batteries are maintained during the winter (when it's not being driven), periodically using a low amp "Battery Tender" maintenance charger.
While poking around under the hood of the Blazer this past July, I noticed that one of its batteries had vented a little acid... We caught it early, so clean-up was quick. So far, I haven't seen any signs of corrosion return. Maybe it was a fluke, but we'll keep an eye on it. The alternator voltage output was measured, reading just over 14 volts at idle.
I bought/installed new "EverStart" 78-series maintenance-free batteries from Wal-Mart in Lil Red a year earlier in 2020 (exactly like those we installed in the Blazer in 2021). So far, the batts in Lil Red haven't vented any acid - nor have the NAPA batts in our 2001 GMC.
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