The batteries come about 2/3 charged and that is what is displayed on the original Sony charger.

The included K&F charger is very basic and has just a red / green indicator light, no status level for the batteries which I would have liked to find here. From that perspective, I am not a fan of this charger, I am not able to check the battery level with it.
The batteries specs (2280mAh / Voltage: 7.4V / WH: 16.8Wh) differ slightly from the original Sony FP-Z100 batteries (2280mAh / Voltage: 7.2V / WH: 16.4Wh) -- I would have liked to see the exact same specs.

The camera (with a firmware 2.0 update) recognized the battery and its charge status is displayed on the screen.

Even with the slightly different specs, the power and endurance seem like the original batteries. I cannot offer longevity observations due to a lack of long-time use.

I have been impressed with K&F products in general and this one is no exception. The charging station takes two forms of USB cable and has easy to see indicator lights. The charging takes the same amount of time as the OEM. The batteries operate the same as the OEM batteries. They check-out in my Sony A7r. I have included a picture comparing the two batteries front and back. The batteries appear to be manufactured well with crisp plastic molding and good contacts.

Purchased this product before I went away to Poland for a car show - these batteries last forever! They really are long lasting and the charger is brilliant, good indicator as to what charge percentage the batteries are at and is really easy to use, takes micro USB and USB C I believe (sorry if I'm wrong) a must have for your Sony camera kit!
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The benefits of extra batteries is a must, but not at the price original ones cost!, these are the perfect alternatives, not only can they hold their charge longer than most, the adapter for dual charging, not only works on these but all Fz100 batteries, plus the added bonus of not triggering the Sony software for being third party items, definitely recommend, worth the money 100%

Cannot detect any differences to the original; is recognized as native by the Sony @7IV @7SIII

very handy. extra two batteries are also good

Recommend that the batteries work as they came from

I recently bought a used Nikon D3300 for use with some AF-P wide angle and telephoto zoom lenses as my older DSLR D7000 will not work with any of these lenses. The OEM battery that came with the D3300 is EN-EL14a and the battery is showing its age. So I ordered these extra batteries and charger set. I really don't need two batteries as I don't use this camera often as I use my other two mirrorless FF and APS-C cameras. But those extra batteries come in handy when I take the camera on vacation and don't have to worry about charging for days.

I have purchased a number of K&F Concept products over the years and they have all been of excellent quality. Those batteries and charger also look great. It came with a charger, two batteries and a generous 3ft charging cable with USB-A and USB-C end connectors. Note, however, that a wall charger is not included in the box. The charger has USB-C and Micro-USB input ports. The batteries were delivered fully charged. The charger works fine, but it has yet to be determined how long it takes to charge either or both dead batteries.

Just like the OEM battery, these batteries can be easily inserted and removed from the camera. Works as expected. These batteries should last a while. One day I'll update this review for the number of shots I get on each full charge. I am happy with this set and given the past history of the products I have owned from K&F Concept I would definitely recommend this set.

Very well packaged, arrived quickly, batteries pre-charged. Inserting the batteries into the charging cradle: a perfect fit, no play, no loose connections, no rubbing against the charging cradle, camera battery compartment, or vertical grip. USB-C charging cable length: 100 cm – perfectly adequate, flexible sheathing. Battery performance: no noticeable difference compared to the original. Excellent! Can be confidently recommended!

They last a long time. I have no regrets about the purchase.