K&F Concept NP-W235 Replacement Battery 2 Pack and Battery Charger for Fujifilm NP-W235 Battery Compatible with Fujifilm X-T5, X-T4, GFX 100S, X-H2S, GFX 50S II, VG-XT4 (2200mAh)

SKU: KF28.0018

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No, it has to be inside the camera to display the battery level 
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This NP-FZ100 battery is not compatible with Sony a6100, the battery model NP-FW50 is compatible with Sony a6100, K&F also sells this type of battery. 
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Battery direct charging: about 4 hours; charging with charger: about 3 hours 
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Sony A5000, a total of 4848, 3 seconds / frame continuous shooting 
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All K&F camera batteries come with a 1-year warranty 
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It is estimated that 1 battery can record video for about 3 hours and take about 3000 photos 
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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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Sony Alpha A7 III, A7R III (A7R3), A9, a6600, a7R IV, Alpha a9 II, etc. 
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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, these NP-FZ100 battery packs are compatible with Sony a7m4. It uses the same type of battery as the a7iii