Needing some spare power for my new Sony camera, the K & F batteries seemed to suit the bill. There are several items to like about them. First, the ability to charge directly via the USB-c connection is a welcome touch. One less item (a charger) to pack and has worked out well. Batteries fit and appear to have no issues powering the camera. Obviously, it's far too soon to determine how well they'll work long term.

There are a few "negatives" although nothing appears too major - yet. My camera was instantly able to detect the "non brand" batteries. It actually flashed a warning about them being "off brand" and any damage that can be traced to them "voids" the warranty. **Yikes!!** Fortunately I've not have any electrical problems with prior cameras using generic battery packs. But still not something you want to see. Unlike the OEM equipment, you only get a generic bar indicating remaining power vs the digital percentage remaining. (This has been inconsistent as I was getting a digital readout when taking the attached image) Nothing earthshaking but disappointing. Power seems to be reasonable, but as I reserve them for backup vs regular usage, I've not completely drained them in one session of use. And don't quite have a good feel for recharge time as not used a straight USB-c connection only a standard to USB-c.

Overall, I don't foresee any problems and I do like being able to recharge them directly. They've worked well to date. But if the camera is able to detect the difference from OEM batteries, it does raise some reasonable doubts.