K&F Concept 4-Channel NP-F Battery Charger with LCD Display for Sony NP-F970, NP-F960, NP-F950, NP-F930, NP-F770, NP-F750, NP-F570, NP-F550 Camera Camcorder Battery US Plug

SKU: KF28.0045US

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The battery will automatically match the voltage applicable to the camera, and there will be no impact on use. 
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Normal charge and discharge is 300-500 times, and after 300 times, it begins to decay to 80% capacity, which is reflected in fast power loss. 
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I can't answer exactly how long, but there is still enough power after 3 weeks 
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It will not cause problems to the data stored on the SD card, please use it correctly according to the requirements of the SD card.