Who's running an AGM battery in a weekend driver?

Pulled the trigger.

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Went to set it in the car last night and noticed there were some puffy spots on the battery tray.
Further examination revealed some were filled with white powder.
Spent 45 minutes scraping and wire brushing, then tried out a very close match spray can I found that's dang near EW1.

Battery is on a 4x4 block next to the car until this afternoon or later.