A false alarm update...
Embarrased to admit that most of the smell must have been coming from the charger and not the battery (Who knew how sulphuric acid is supposed to smell?). The plastics and the components in the brand new charger must have warmed up for the first time -- possibly combined with some fumes from the battery as it initially drew a lot of current after being unhooked for almost a month. Now the battery is full and the charger is in trickle mode. They are sitting in a room inside, with no smell at all. As a precaution, I'll still only keep them hooked over weekends when I'm there to keep an eye.
Z.
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