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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No, Only one charger, but can charge two batteries at the same time. 
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I can't answer exactly how long, but after 3 weeks there is still plenty of charge 
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Hmm.. I've never timed it, but it's the same as the original battery. I usually use 2 knots for full day shoots, which is literally a full day (8-10 hours). 
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Compatible, it uses the included USB Type A to USB Type C cable, so you can plug it into a travel adapter with a USB port. 
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No, it has to be inside the camera to display the battery level 
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The LED light will turn green when there is no battery in the charger or when the battery is fully charged. The LED light will be red while the battery is charging. 
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Normally, it is charged and discharged 300-500 times, and after 300 times, it begins to decay to 80% capacity, which is manifested in rapid power loss. 
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Battery life varies with different video camera quality settings