This is a REVIEW of the SET/lot of camera or camcorder items for sale on AMAZON with the description:
K&F Concept 3-Pack NP-FZ100 Battery 2280mAh and 3-Slot LCD Charger for Sony FX3 FX30 A7 III A7 IV A7R III A7R IV A9 A6600 A7R3 A7S III/A7S3 A7C Alpha 9 Alpha a9 II Alpha 9R A9R Alpha 9S Camera.

This is a PACK of charger and three high-capacity nominal batteries, with the possibility of simultaneous charging with a status indicator display for each of them. The power input connection (5v. can be made either by the USB-C or the USB-Micro port, both located on the side of the charger (adapter cable to USB-A included, adapter power supply not included).
The contacts and battery housings fit perfectly with the SONY models that support NP_FZ100 battery, used by this brand in photographic cameras from the A7 / III model (which is the one I have been able to compare them with), that is, the R and S versions (high resolution and high sensitivity) of this same ILCE A7 III model, and also the two A9 / A9 II versions, and their ""R"" versions (high resolution), and at least for a small sensor APSC format version, the latest A6600, and even for a couple of FX / FX30 Camcorder models.
The biggest limitation is in the simultaneous charging time of the three batteries at once, regardless of the power input power. , simultaneous battery charging can take over 6 hours, this is not a concern if we leave them all connected in the evening when we are not going to use them until the next day. But if we have some discharged and we need the camera to work in shorter periods of time then it is better to connect only one of the batteries to charge so that it can be charged in a little less than half the time, (about 2 hours and 1/2) and then leave the other two charging for a period of about 4 hours, (all this if we put them on charge after a complete discharge).
The stored current capacity of each battery is up to 2280mA/h, and the nominal voltage of these is 7.4 v., which means a power limitation of a little less than 17 W/hour, well below the maximum consumption of this type of camera or video camera.
The price/charger + number of batteries (3) / battery capacity (2280mA/h) ratio is very good at the time of this review (about €70 - an additional discount of -15% applicable for quick purchase, ticking the option before making the purchase), this means a final price somewhat less than €60 (it would not reach €20 per battery taking into account only these. For this reason of price ratio with the versatility of the PACK's Autonomy, I have decided to give this article a rating of:

"" 5 STARS "" = [ * * * * * ] .

I hope you find this review useful, if so let us know, thank you. Best regards.