A:AnswerHello! we have attached a link for comparison of the different series. https://www.usa.philips.com/etc/philips/b2c/compareproducts.html?locale=en_US&catalog=CONSUMER&ctn=MG3750/60,MG7770/49,MG7750/49
A:AnswerIt does have a battery, however it is not USB rechargeable. It has a proprietary charger that plugs directly from a standard wall socket to the unit. Hope this helps!
A:AnswerIt holds a charge better than anything else I have with a rechargable battery. I have had mine 2yrs and have only charged 4 or maybe 5 times, I have never ran it all the way until it quits.
A:AnswerYes, plus it has extensive and high-quality attachments to help. I am one hairy guy, but this thing doesn’t break a sweat. Really impressed by it
A:AnswerEnter Model Number MG7770/49, that's the model number for the 9000 kit. I had the same problem but if you look on best buy they give the right model number and so does other distributors.