Battery light comes on and off regularly. Local parts store says the battery is fine and charging. Today the car cut out on me twice, once at idle and another as I began to accelerate. Related? Drove other ten miles without any problems -- just the battery light coming on. Thanks for the advice!

check battery connections all the way to there ends may be bad ground or alternator not charging when you get it running go to local auto parts store have them check voltage output or charging power

Get a volt meter, start your car and see how many volts your car is producing while running. Should be around 14 volts. May want to watch the meter for a while since your electric seems to fluctuate. Most voltage regulators are internal of your alternator. If you are getting a lot more or less than 14 volts while running, replace the alternator. If it is not charging, voltage will drop as vehicle runs, until battery is dead.

Have your Alternator checked for free at your local parts store...The battery light blinking is an indicator that the alternator may not be fulling charging your battery...a good check before you are stranded...Hope this helps.

Stop by local Autozone,advance,etc.. parts store and have them test your charging system (Alternator) sounds like it's not charging your Nissan

alternator commutator/brushes on last legs

have the charging system diagnosed. Most local auto parts stores can do this for free.

That is correct! Your alternator isnt putting out the necessary voltage/amperage to keep the battery light off.

Have the vehicles charging system checked at a local parts store. They can also do a free load test on the battery. Just to be sure.

when the battery light comes on, it doesnt Usually mean your battery is bad. it tends to be the charging system. take your car to your local auto parts store and have them run a diagnostic on the charging. they tend to do it for free, and it only takes a couple of minutes.
usually this will happen if your alternator is going out, or the voltage regulator. however, there is a possibility that your battery is not holding the charge anymore, but their test will tell you that as well

have the engine wire harness checked maybe a communication problem between modules.

Take in your car to an auto parts store and have the battery tested....and, the alternator.