(ET) weeping battery?

[tbamc <tbamc gbta net>]

The used Trojan T105 I recently bought is doing something I've not seen 
before.  When I got it the water was down to the top of the plates so I 
filled each cell to the bottom of its fill 'tube'.  It's still sitting 
on the floor of the garage, and each morning there is a puddle or two of 
water on top of the battery.  The cap is pushed down tight.  The battery 
had acid/mineral/ deposits near the bottom on one side when I got 
it--I'd hoped it might have been leakage from a neighboring battery, but 
now I'm not so sure.  Any ideas?

Thanks.

Thon