K&F CONCEPT NP-FW50 battery and dual slot battery charger kit for Sony Alpha 7, A7, Alpha 7R, A7R, A7R II, A7 II, A7S, A7S II, A7M2, A7SM2, A7RM2, A5000 A6000 A6300 A6500, a3000 , NEX-3, NEX-3N, NEX-5, NEX-5C, NEX-5N, NEX-5R, NEX-5T, NEX-6, NEX-7

SKU: KF28.0004

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Yes, this charger also works with Canon batteries. 100% original compatible. 
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can't answer exactly how long, but after 3 weeks there is still plenty of charge 
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This is 2 batteries with charger. Not a cable to download anything. 
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Product includes 2 batteries and USB charging cable 
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It depends on many factors, the mode of your lens autofocus/whether you use flash/whether you shut down after taking the picture or wait for the camera to automatically sleep 
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No, it's just a micro USB cable in the package. You need to use your own USB plug to charge it. 
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I've pretty much only used these batteries when doing video work, and haven't gotten any hum. Hope this helps. 
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All K&F camera batteries come with a 1-year warranty 
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yes it can.. because it is a usb charger 
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The LED light will turn green when the corresponding battery is fully charged.