K&F Concept NP-FZ100 Battery and Charger for Sony A7iii Battery Compatible with Sony FX3, ZV-E1, Alpha A7iii, A7IV, A7RIII, A9, A6600, A7R IV (2 Pack 2280mAh Lithium-ion Batteries)

SKU: KF28.0005

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It depends on the charge in the battery and the type of charger. I'd say about 3-4 hours. 
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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