Hi RR_NDB,
First of all thank you for all your interesting posts!
You wrote in post#27:
Each cell has it´s own valve (hole near plus terminal as posted earlier).
By valve i mean a hole where breathing of cells can pass through. A pressure gas passage.
I am not sure there is a vent at all for the following 2 reasons, and I am referring to the info given by the manufacturer in this link.
http://www.s399157097.onlinehome.us/...s/LVP10-65.pdf
It is stated that the cell has a Sealed Structure. I suppose that it means that all gases (normally!) will be held within the structure of the cell, just like on a AA battery, so no need for a vent?
On the picture "Cell construction" there is a white circular "thing" just below the plus terminal labelled "Rupture plate".
I suppose that this plate will blow out, if some serious failure has occured within the battery in order to relieve excess pressure.
My view is supported by the info given in post#772 in the thread Battery and chargers, where the JTSB states that "the safety valves 7 and 2 open".
Safety valve = Rupture plate?
Or maybe you are referring to another hole in the cell.