I shoot a Sony A7r4 for photo and a bit of video - When I do indoor shoots with a tripod, I use a wired battery adapter. But then there's every other time, which is how I got here.

I've already got a few other pieces of K&F gear which I consider well balanced for quality vs price. Photography has never been inexpensive, so I look for opportunities where I can. Let's dive in.

As of this review, we're at around $50 for this bundle, which is quite drastically lower than the Sony equivalent. Sony gear is quality, yes, and you pay for that, yes, and typically don't regret it, yes. But I have a thing with batteries. I don't want dubious ones, but overpaying for proprietary ones, also nah.

Refer to the photos.

Packaging: perfectly adequate for the contents. No styrofoam. I despise styrofoam. Check.

Included items: some reviewers received type A to micro usb cables. Mine arrived with a type A to usb c. Not sure why, but I'm always glad to get a C these days. The cable isn't fancy. I don't really care. Check.

The batteries themselves: slightly lighter than OEM, build quality, perhaps a negligible tad less. Claim 2280mAh at 7.4v,16.8wh. OEM 2280mAh at 7.2v, 16.4wh. So, on paper that might sound better. It actually isnt. Other reviewers performance notes accurately measure slightly lower runtime. The camera doesn't need 7.4v, those 2280mAh expend quicker for no appreciable gain. However, the difference is minor. Don't worry about it. Instead, appreciate that K&F managed to produce a battery that doesn't throw a warning when you power up the camera, and are forced to "accept the risk". Lots of after-market batteries have that issue, these don't. For me, this is a big plus. Good job K&F.

The charger: light, not robust, but not janky either. The USB options are a compromise. Sony's standard single bay is an AC plug and you get a lot more juice for "quick" charging - It's also a reliable source. USB is more versatile and convenient, but less input. So. 700mA for a single battery, dropping to 500mA for dual. It's gonna be slow, and your USB input, well. Who KNOWS what you're going to try charging with. Something embarrassingly inadequate, perhaps. Anyway, that's the trade-off. I'm fine with it. Observe the difference in size. Do I miss the meter from the OEM? Yeah, somewhat. But the two chargers are interchangeable, I tested that. Cool.

Durability, we'll see. My other K&F gear has held up quite well, I do treat it respectfully and I don't use it all day every day. I'm waxing optimistic.

Conclusion: this bundle is like... Less than a quarter of the OEM price. Haha! Five stars. Hope this review was helpful to you, happy shootin'.