NP-FW50 Replacement Battery 2 Pack and Charger for Sony A6000, A6500, A6300, A6400, A7, A7II, A7RII, A7SII, A7S, A7S2, A7R, A7R2, A55, A5100, RX10

SKU: KF28.0004

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No, Sony A7IV is compatible with NP-FZ100 camera battery 
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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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Yes, this is a new decoding battery, the battery is suitable for charging on the original camera, and the original camera can also be used in the matching charger. 
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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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Yes, K&F's charger will charge Sony batteries 
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It depends on many factors, how much your lens autofocuses, if you use flash to turn off the camera, etc... 
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If the power is exhausted, use a 5V 2.1A adapter to charge it. It is estimated that two FW50 batteries will be fully charged in 2.5-3 hours 
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Personally, I charge the battery ahead of time or when I arrive at my destination hotel. I then store the battery in my camera bag, separate from the charger. So far, I'm happy with these batteries. 
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Sony A7-M3, a total of 3672, 3 seconds / continuous shooting 
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Product includes 2 batteries and USB charging cable