Sad news. I brought the two dead batteries indoors. My fancy CTEK managed to recover one of the AGMs last night and it reads 13.18 this morning. Waiting on the second battery.
Keep in mind that the "renew your battery" process is not a lot different than putting a can of stuff in the engine to keep it from burning oil. It's a fine way to get a bit more life out of a nearly dead item. It very much does *not* return it to "like new" condition.
Of course if you can come across enough free batteries ... they can't all be nearly dead ....
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