There’s a lot of confusion around AGM battery venting, especially for interior or under-seat mounting. They all say “no liquid to spill, etc” but the gas can still escape.

So the OEM AGM in the Defender has a vent tube requirement. That is not cheapness, it’s OEM safety engineering for worst-case events.

All AGM batteries, including Odyssey and Optima, do in fact have vents and designed to vent under overcharge or thermal events (not normal usage or charging tho).

I wasn’t familiar with Odyssey having never owned one but their technical manual states that the battery should not be mounted with the vents inverted and then also see Page 13 of their technical manual:
https://www.odysseybattery.com/wp-content/uploads/AMER-EN-TM-ODY.pdf. So venting external is possible under problem conditions.

BTW Optima (not dissimilar in how they market their product) shows and discusses this themselves here:
https://www.optimabatteries.com/experience/blog/lead-acid-battery-ventilation (PS I personally think Optima is garbage, batteries have let me down)

So I personally would not choose an AGM battery under-seat or interior mounting where there is no way to route a venting event outside the cabin. I’d go either stock setup or Lithium Ion (Antigravity, etc).

 

Thanks, I'll look into it. Maybe I just never noticed but I'm going to check the 2 under the hood in my LR3. They are the PC1350 and PC2150 extremes

 

Here what happens when you cant sleep at 3:30 in the morning.

 

Nice, done by yourself ?

 

Very nice!! Where did you get them and do you like them?

 

Yes, done myself. Just pop the plastic piece out, lay CF piece over top, apply heat and smooth and wrap, re-install

 

I went the same route today, it was a fun project.

 

Love the look of that on the white! Mine has held up nicely over the years.

 

 

I was bored this evening so i decided to tint my front windsheild 35%.
Tape cut line and shrink.
Finished product