I Cannot Keep My Delco Battery From Leaking Acid Under My Seat???

I am starting to wonder if some of these GM engineers have ever worked on a car before? One of the many problems I have with my 2000 LeSabre is that it seems as though the AC Delco battery which is concealed under the rear seat will not stop leaking small amounts of acid. I recently had the battery replaced at a GM dealer in arizona where they completely neglected to re-connect the battery vent assembly, so of course I lifted the rear seat one day and discovered battery acide everywhere. I went ahead and replaced the entire vent assembly with replacement parts from the dealer and got everything totally cleaned up. I even re-painted the battery tray and installed a new bolt to hold the battery down. When I put everything back together it was spot free and perfectly clean. Just yesterday I lifted the back seat to check on the status of things under there, and I found corrosion everywhere and of course battery acid eating through my floor pan again. This stuff is so simple you can't mess it up, the rubber vent connectors just push on and the plug goes through the floor pan, but somehow I guess as I am driving around the acid slowly seeps out of the push-on rubber connectors and starts rotting the carpet again. The battery works just fine, I don't have any electrical problems and the terminal connectors are perfectly dry. I am hoping that a GM technician sees this post because I am curious to know why battery acid would ever end up in the vent tubes. It seems to me like a sealed battery should be designed to contain the liquid, the vent tubes should be there to vent off any hydrogen gas that builds up in the battery, but I don't see why I would ever have a liquid leaking out of those vents.

It is possible that your alternator is overcharging at times and causing the battery acid to spill over. It should'nt be happening and if the alternator is not over-charging at the time of checking, they will not replace it. If you have a gauge in the car, I'd watch it carefully to see when it starts to over charge.
Good Luck.