BOSCH 12v AGM 51-440BAGM does not need to be vented!

They were mistaken. When I purchased my Bosch 51-440BAGM battery from Pep Boys it had a plastic vent elbow already attached on the right hand side of the battery. I pointed it out to the sales clerk, he said, "No problem!" On the left side of the battery is also a vent port with a cap on it. Pop that cap off, move the vent elbow to the left hand side and the vent port cap to the right hand side.

These batteries were specifically designed for the Prius and specifically designed to be vented to the outside of the vehicle. If you look at the sides of the battery, near the top, horizontally centered just below the seam where the top of the battery meets the case (or it might be up in the blue top of the battery) you will find a vent port on each side. My battery came with the vent elbow attached to one port and the other port capped. The vent tube in the car fits right onto the elbow that came with the battery. Since the battery already has the vent ports and even if you have buy a 25 cent plastic elbow for it (which is supposed to come with the battery for "free"), then why would you not just use it?

I'll post a photo of mine when I get home.

Right on their website:
Bosch Premium Performance Battery Group, Size 51 | Tire Details | Pep Boys

"BATTERY IS VENTED OUTSIDE OF VEHICLE - OE BATTERY IS AGM ONLY REPLACE w/AGM BATTERY - S6 HIGH PERFORMANCE AGM - OE CCA: 325"

 

Here are the photos of a properly installed and vented Bosch battery. On the other side of the battery is a vent port in the same location, it has a black plastic plug in it.

20170301_132615 by NavyLCDR posted Mar 1, 2017 at 2:12 PM

20170301_132657 by NavyLCDR posted Mar 1, 2017 at 2:12 PM

20170301_132720 by NavyLCDR posted Mar 1, 2017 at 2:12 PM

 

AFAIK, OP has all the items need to vent the battery, well that is if PepBoys didn't pull it it out. Barring that: all he has to do is lift up the floor and plug it in.

(I've got a hunch when the floor is lifted: the vent plug will be connected. Maybe just a miscommunication??)

 

I have a feeling the elbow to plug into the vent port got lost during battery storage at the store. Mine was not glued in, just pushed in. I have a hunch if the OP looks at his battery closely he will find a capped vent port on one side, and an empty vent hole on the other side .

Wanna bet on it? ;-)

Like you said, though, normally everything required to vent the battery is already included with the battery and it takes less than 1 minute to connect the vent tube to the correct side and cap the other side so it makes no sense not to do it.

 

The elbow from the original battery may fit in the hole. I know my AGM "Motormaster" battery was very close to the original stock one. Oh, and with it I had to move the vent to the "correct" end of the battery, moving the plug also. I think the "Motormaster" is an Exide. At any rate, the OP should MAKE SURE the store finds an elbow and installs the vent correctly. The battery will probably not vent enough to ever cause a safety issue, but you -may- eventually smell it!

 

When I replaced my OEM Yuasa battery with Optima, the new battery had the correct hole correct side. The elbow on the vent tube fit and locked positively. As far as I know the elbow at the end of the vent tube is a Toyota part, ie: part of the car.

Vent Hose for 2010 Toyota Prius|28885-37010 : Toyota Online Parts | toyotaonlineparts.com | Toyota Parts Online

 

I wonder if prius4-me ever got his battery properly installed?

 

Well, from the Muppet show - "This machine is the most reliable machine ever made. Nothing can go wrong....go wrong....go wrong.(etc)" Anyway, you get the idea.

So, -if- something does go wrong the battery will vent water vapour, H2S, acid vapour, H2, and O2 into the car. You don't want that. A simple vent tube will fix that, which you now have. Possible problem solved, car meets many standards now.

 

Where are you Group size 51 folks finding adapters that allow you to use fat posted US batteries with Priuses that expect JIS-style pencil posts?

I just paid $230 for an exact fit JIS pencil post Prius battery and swore I'm not going to do this again when the other Prius needs a battery. They cost too much and few dealers stock JIS posted batteries.

 

Here is a link, but you really don't want to Installation Kit for Optima battery in Prius

 

Apologies for ressing this thread... But is this battery discontinued? The landing page/link for it on Pepboys is still active, but does not let you order it.

 

The best battery is at your Toyota Dealer 84 month (prorated) warranty.

The cheapest battery may be www.amazon.com/ACDelco-ACDB24R-Advantage-Automotive-Battery/dp/B010GKJ8F6