Pressure testing batteries

[ginetto]

as said in this thread, one further step after leak down test, is to fill the battery of nitrogen to dry out. Some rough calculation give me that:
1) a leaf battery case is not more than 0.45m3 (probably would be something like 0.2 or much more less because filled of battery modules)
2) a liter of liquid nitrogen (commonly used in refrigeration world from 1l bottle for 20/30€) is 0.69m3
=> would be necessary at least 1 entire 1l nitrogen bottle to do 2 or 3 of nitrogen refill. Is it enough to have a decent dry out?
opinion @TronJockey ?

 

[ginetto]

I did the test slightly more than 24h after added A LOT of sika 221 (two tubes also because a lot of previous sealant was removed). The test was successful e.g. gave the same leak as before opening the pack.
Other person professionally building water proof boxes and using sikaflex product , do the test after 48h but they test from 1 to 10 atm.