[RE-wrenches] Battery "event"

[Kristopher Schmid]

Since we are talking batteries... I had a scheduled checkup on an inherited
stand alone system last Tuesday.  On Monday night, the client called to
tell me that a battery blew up in his face when he was adding water (no
doubt to prevent being scolded by me regarding fluid level maintenance).
He assures me that there was no metal in the vicinity and, indeed, I saw no
evidence of a short on the terminals.  Judging by the rest of the pack,
it's likely that the plates were exposed and he was adding fluid with hard
solar charging in progress.  Fortunately he only suffered an injured finger
and a ringing in his ears.

Best guesses at the cause of the explosion?

Picture attached.

Thanks,
Kris
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