House battery voltage under draw?

landyacht318 wrote:
The Costco interstate 6v sold in my part of California are apparently Trojan t-605s, with 210AH and 58Lbs of lead.

Pictures?

As I said, I saw somewhere a claim that they were Deka. But, looking into it myself, I'm pretty sure they're JCI.

Here's a Costco/Interstate one:


Note that the case is very different, it doesn't have the ribbing toward the bottom which a Trojan has:


Now, look at a couple of batteries known to be JCI. Varta:

and Delkor:


The cases match. Also, the post insulator/nut holder is the same (there are other pictures of the JCI/Varta showing that, too). The specs for the Varta 300 208 000 match the Interstate/Costco - 208 Ah, 63 lbs (28.8 kg). And, you can find pictures where the cap opening mechanism looks identical.