Now if this had been a week or so ago I'd say hot foot it down to lidl and get a charger ar £4.99.
I'm not expert, but know how a flat battery sounds and how you described it - that was how I would describe it.
I would charge it up and see how it goes - once you've passed your test. If it seems to be a problem get a new battery, it'll save hassle in the long run. Also if you are not gonna ride every day then think about an Optimate - what the guys above call a tender. Just plug it in at the end of the day and it keeps the battery in top condition.
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2007 Triumph America...and no bike licence... (dumb dumb and dumber)
Not dumb, dumb and dumber.....when I put the deposit down on the 03 I hadn't passed my test either....I just then continued and failed first time. But passed 2nd time around...I was lucky enough that I was still trundling around on my 125....but every time I went past the dealer I could here her calling...
06 America - missing, presumed in bits. With it's TBS wheel... 
09 America - It's very blue....
