K&F Concept EN-EL14 Battery and Battery Charger for Nikon EN-EL14 EN-EL14a Battery Compatible with Nikon D3500 D5600 D3200 D3300 D3400 D5500 Coolpix P7800 P7700 P7200 P7100 P7000 (1050mAh*2)
SKU: KF28.0020
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You can charge 1 battery individually or 2 batteries at once if desired.
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one year
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I guess that means they are safe to use the camera.
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No it doesn't, it seems like none of the batteries have a date code
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Yes, micro USB and USB-C are supported. It's great because you can use any micro USB cable and USB-C and take it with you.
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Regardless of supply voltage, all USB ports output 5VDC, between 0.5 and 2.5 amps. Any USB connector will work fine.
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Yes, it charges them quickly and then the light for that slot turns green. To me, that's an indication that it's going to lose power because the battery isn't hot the next day. (No, they don't need to be charged overnight, they're fast.)
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New decoding, support original charger charging
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It's hard to say exactly when. I've tried and can take over 1000 shots on a fully charged battery, hope this helps.
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Personally, I charge the battery ahead of time or when I arrive at my destination hotel. I then store the battery in my camera bag, separate from the charger. So far, I'm happy with these batteries.