Hello I am new here, I've searched the forum some to see if I can get my question
Answered. Didn't realize how big it is!
I have a 2005 Bonneville GXP with a dead
Battery, current battery is a red top Optima
AGM battery. After charging for 24hrs I am at 12.45V . Think it needs more plus charger hasn't automatically stopped.This battery was bought 7/19 so hope to have some warranty left on it.
There is a black square item the has a
Wire or tubing going into the grommet behind the battery just up out of the battery well. Is that what vents gases out from under the seat? If this has been asked before can you give me the link? Thanks much.

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Mike5631 2004 Pontiac Bonneville GXP
Northstar V-8

Yes it is the vent. If your Optima is a gel battery then don't worry about the vent tubes. OE battery is a 79 series battery.

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Andrew - owner/operator of Bonnevilles Unlimited

2004 Bonneville GXP | 60k | White Gold Tricoat | custom built supercharged 3800 hot rod | garage queen
1997 Corvette | 55k | Silver Metallic | Z06 wheels | Date-night Hauler/Parts runner
2014 Town & Country Limited | Cashmere Pearl | 95k | Family Hauler
2002 Ram 1500 Quad Cab Sport | Black| 260k | Official Bonneville Hauler

Ok thanks I did do some research and found its purpose. What threw me was it was unhooked. And the battery dead

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Mike5631 2004 Pontiac Bonneville GXP
Northstar V-8

Update: now so you know I am NOT a mechanic i have learned from family members who are either mechanics, or very knowledgeable on cars. Plus my over 40 years of maintaining my cars.
I appreciate forums like the Pontiac Bonneville Club for the knowledge base.
So I did a full fluid check (not the trans though) and made sure the tires were aired up. Put in my red optima battery. And cleared the previous trouble codes. To where there is no check engine light on.
I decided to take a short drive, and purchase some fuel too. Everything is going well, until I decide to extend the drive home. I started smelling that rotten eggs smell, so I am a bit worried. I then get this burning smell. I think could it be the car infront of me? No such luck. I make it home and I see smoke in the rear passenger area. Rear seat removed for test drive. I jump out and look in the battery well and the freaking battery is smoking! OMG!! I pulled my wrench out and quickly disconnected the battery. And carefully pulled it out and on to the front yard.still smoking!
As you recall the car (which actually belongs to my brother, Mark.hes a member here too.) Sat for 8-10months and the battery was left connected the whole time. I charged it for 2+days (not using my microprocessor charger...big mistake! So the alternator was putting out alot of juice recharging the battery and it became over heated. I'd say its toast and wouldn't even dream of putting it in the car. So its off to be recycled!
I know I probably sound stupid but want others to learn from my lack of insight.
The car did run pretty good a noticed a slight miss as I was about to make it home.
Just glad it turned out the way it did.
Sorry so long a post

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Mike5631 2004 Pontiac Bonneville GXP
Northstar V-8