These 3rd party batteries are almost like the original that came with my X-T5. Out of the box, they were already 75% charge. Nice.

Physically, they are identical except for one thing, as far as I can tell. The ends of these batteries are not completely flat. If you place one on its end, you can rock it back and forth. About a third of the ends has a slight bevel. Nonetheless, these batteries go in and out of the camera without any issues. Another oddity is that the orange covers can only snap into place in one orientation. And the reason I find this odd is because the covers have a battery shape cutout that you can use to identify whether the battery is charged or not by the orientation the cover is attached. These covers don’t fit the original Fuji battery, because its ends aren’t beveled.

Weight wise, original=80g, these=78g. Close enough.

Electrically, these batteries seem to perform the same as the original, despite the 0.2V higher output voltage and 0.2Wh higher capacity specs. They don’t generate more heat nor have any side effects, as far as I can tell. The X-T5 was even able to read the age of these batteries (yes, as new.)

Unscientific methods show that the discharge and charge times between these and the original are roughly the same. Using the included cradle and the 5V,3A AC adapter that came with my X-T5, charging a single battery from near 0% to 100% took about roughly 4 hours. The cradle regulates the power output to 8.4V, 700mA for one battery and 8.4V, 500mA for two batteries. K&F specs an AC adapter capable of at least 5V, 2.1A , and using a more powerful adapter probably isn’t going to help with charge times.

Each of these batteries (at the time of this review) is about 1/3 the price of the Fuji’s, which given how they perform, is a great deal. I can’t tell yet how they perform in the long term, but given the price, I don’t think I can complain regardless.