ORIGINAL: najary
(...) As long as the temperature of the air passing though the battery is lower then the battery temperature itself it is still good.
Best regards,
Isaac Najary
Not completely true... that's just one factor to take into account; you have to consider also air flow (or how much air pass passes licking the battery surface) and battery mass. The diff. of temperature DT has to be also evaluated considering the air flow too... big flow => small DT allowed; small flow => big DT NEEDED
In any case, and from the constructive point of view; take good care of air intakes and (specially) air exhaust rather than air temperature.
There are several gold/thumb rules to apply here...
regards;
G.
PS; Issac, thanks for posting so detailed photos and building tips; really appreciated.