NP-FZ100 Battery Charger Set for Sony Alpha A7 III, A7R III (A7R3), A9, a6600, a7R IV, Alpha a9 II (2-Pack, Micro USB Port, 2280mAH)

SKU: KF28.0005

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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 
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The NP-FZ100 battery pack will not cause problems to the data stored on the SD card while charging. 
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These NP-FZ100 battery packs are compatible with Sony A7 III, A7 IV, A7RIII. Not suitable for Nikon cameras. 
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Compatible with SONY brand FZ100 battery, you can confirm the original battery model in the camera. 
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I use these batteries interchangeably with Nikon EL15A/B batteries on my D500 and Z series cameras. The charger can also charge Nikon batteries. 
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This battery works for my Z6! This battery will charge in the camera! ! ! I haven't completely drained my battery yet! Hope it gives me something other than just 100of the first shot3Square batteries work better! EN-EL15The performance of the built-in battery (Nikon) is also poor, 102shooting, only open 2Hour! 
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I've charged them with a Nikon charger with no issues 
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As far as I know, D2x only needs en-el4, not el-15. 
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Hello. Have you checked what battery part number your camera is using? This is the best way to find out if this product will work for you. I have a D90 and a D810, both use EN-EL15 batteries.