Ok, they are "Battens", not "Batterns", or "Battons", or (god forbid) "Batons".
There's only one spelling: "Battens".
Singular - B A T T E N
Plural - B A T T E N S
See, it's easy. 
Select to expand quoteMark _australia said..
Not an issue if you take up kitting
Batons could be though.
) not battens and are technically called (left); a bargeboard or barge fascia & (below); a fascia board.
Select to expand quotesausage said..
I broke a batton carve gyping my salom bored when the clue come undun.
eye broak r batton karv gyping mi salom bored wen da clue cum undun.
Welcum 
Select to expand quotegavnwend said..
I better batten the hatches.
That's "button the hutches".
spelling is one thing ...
terminology is another
here some people call the boom a "wishbone"
others think they are talkin about chickens
pronunciation is another thing completely
if someone is planning on a new board - would like to see them plane
perhaps if all this "bothers" people that much
make videos like this one 
spelling and pronunciation - all in one
(put some pics and all will be talkin about the same thing)
Well hell, all this time I was figuring that "batterns" was the Ozzie word for "battens", so I was just letting it ride, along with "kit", which we usually refer to as "gear", or "equipment", or just "stuff" or "junk".
Somebody posted a vid here awhile back that was about the Ozzie words that are unique to Oz, as explained by an attractive brunette, it was a hoot.
