K&F CONCEPT NP-FW50 battery and dual slot battery charger kit for Sony Alpha 7, A7, Alpha 7R, A7R, A7R II, A7 II, A7S, A7S II, A7M2, A7SM2, A7RM2, A5000 A6000 A6300 A6500, a3000 , NEX-3, NEX-3N, NEX-5, NEX-5C, NEX-5N, NEX-5R, NEX-5T, NEX-6, NEX-7

SKU: KF28.0004

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Hmm.. I've never timed it, but it's the same as the original battery. I usually carry 5 batteries but never need to use 5, I only use 2 for all day shooting, which is literally a full day (8-10 hours). Hope this helps. 
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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. 
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It uses the accompanying USB micro b to USB Type A cable, so you can plug it into a travel adapter with a USB port. 
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Simply connect any 5V 2.1A Max output power source via the Micro-USB cable to safely charge the battery in the included charger. The connected power source can be a mobile phone adapter, a car charger, or a power bank, etc. But please do not directly connect the charger with power supply higher than 5V 2.5A. 
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Yes, if you want to charge faster, you can also use a wall charger 5V/2A to charge the battery. 
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Normally charging and discharging300-500 times, after 300 times, it starts to decay to 80% capacity, which is manifested in rapid power failure. 
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You can charge 1 battery individually or 2 batteries at once if desired. 
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one year