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You probably mean a Milwaukee mitre saw. McCulloch does not make a mitre saw. Go to eReplacementparts.com and enter your make and model number. If they don't have it, its probably not available anywhere. You'll have to go to a machine shop instead. Look it the yellow pages for "Machine Shop".
I would plug it into another outlet first. The small arcing that you see might be normal especially on stopping because of the brake. If another outlet doesn't work then I would take it back. Upon startup this saw will draw more than the rated running amps.
If it is a new lithium ion, they just stop dead when the battery is dead and just needs to be recharged. If that is not the problem then it sounds like the battery is not connected to the saw very well, see it the connections inside the saw are bent or damaged in some way.