K&F CONCEPT EN-EL14 Quick Dual Battery Charger & Batteries Kit (1050mAh) With Micro USB & Type-C Port, for Nikon D3500 D5600 Coolpix P7800 P7700 P7200,etc.

SKU: KF28.0020

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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.