Does this battery have a vent ?
I never noticed if it does

 

If you study the photo carefully you can see the boss at each end where the vent or plug are inserted. They are roughly inline with the word 'BATTERY' printed on the top on the left. So yes that battery has vent holes. The one against the firewall should have a plug in it and the front facing hole should have a vent trap or a hose that directs any spillage away from the car body. We have seen the damage that the acid can do.
My AGM battery has vent holes in it, as the chemical reaction in all lead/acid batteries produces gasses.

 

Nanoseconds is all it takes. I going to assume this thread is mostly venting about getting old and weak. I resemble my remark but geez. It won't lift straight out, ok, won't move side to side, ok, won't move back, ok, forward and out at an angle.

Les

 

I moved my one forward just to look at the bottom clamp, it is not necessary that it be tightened, it may or may not form a lip for some batteries to go under. I think it does not from what I see.

I think that some people will tend to over tighten the top clamp strap, I tighten it so that it will still deflect by moderate pressure pushing it down by the nut.

 

I agree with this comment. Holddown clamp really only needs to be tightened enough to keep battery secure. The battery is such a tight fit in the tray, it isn't going anywhere. Add the fact that the battery cases for the 48H6 Series used in our Crossfires differ from one manufacturer to another. The Duracell Ultra 48H6 I got from BatteriesPlus earlier this year has the case height slightly taller. So the holddown strap had to be slightly bent for it to lay flay across the top. Otherwise, the holddown clamp applied too much pressure to the edge of the battery case on the fender-side.

Later,