Very light and compact. Not the fastest charger, but benefits from charging two batteries at once.

I charged the batteries 1 month ago
When first used, they showed 99%.
So no discharge in the meantime.
During a photo shoot with -1 degrees they withstood the shock well.
4 batteries for about 700 photos. (2 Sony+2 in the kit)
I did not check the difference in discharge according to the brands but with respect to my use it is really a good choice.

Now to see in time.

November 2, 2020
After one year and a few months of use, the batteries work well, up to 30% of battery life remaining, then they are empty all at once, so be careful because over time they lose their discharging powers.
I also noticed that it took longer to charge.
While my 2 Sony batteries have no problems currently.
So I will go ahead and buy two Sony batteries and keep my 2 batteries as backup

October 2021

Well that's it they no longer hold a charge
Drain quickly and go to 0 to 30%
I will keep the charger which is practical and recommend a Sony battery.
They did the job anyway but my Sonys are still top notch.

Really good replacement for the original sony batteries for Sony a series cameras. I tested them and they are even better than the original ones. They lasted longar than the original ones and oh how I love the slim double charger, AMAZING!
I reccomend totally worth it!

UPDATE: K&F Concept customer service was excellent and sent a replacement battery. This battery is fully functional. Updating my review back up to 5 stars due to K&F Concept's responsiveness and customer service, which can be hit or miss with overseas brands. I have no problem recommending K&F Concept as a responsible brand.

--- Original Review ---

Ok, first the Pros:

Small form factor
Charges batteries reasonably quickly - including the standard Sony brand batteries.
Easy USB-C connector.

Cons:
One of the two batteries was completely faulty and would not take a charge, right out of the box.

I've reached out to K&F Concept Customer Service and will update this review based upon the results of the resolution of the issue.

I have a Sony A6000 and it fits perfectly. The battery format is the same for the entire Sony Alpha line, even on those with a full-frame sensor; it's good to know if I want to upgrade my hardware one day and replace my case with a better one.

The charger and the two batteries correspond to the description. I've seen comments that said these batteries didn't hold a charge or weren't as good in quality as the official ones. For my part, I did not notice any difference and I emptied these batteries and the one that comes with the box several times. This is very reassuring and it feels good when you see the price difference between these and the price of the batteries produced by Sony (between 65 and 80€ each depending on the site)! )

A little extra: the charger for these batteries is so practical that I don't even carry the charger that came with the Sony A6000 anymore. I just have this one with me in the bag since it is much more practical and compact than the “official Sony”.

Anyway, it's a great buy.

If my review was helpful to you, feel free to say so.;)

Amazing value, but battery last about 10% less then oryginal. Having said that it is fraction of the cost plus you get quick charger.

I've been using these batteries (for my a6000) and charger for nearly a year now and haven't been disappointed. Sure the batteries don't last as long as the original Sony ones but that was expected and they are much cheaper. Charger works well and is handy and still use the spare batteries all the time. If you're looking for some cheap spares then these are a good shout!

I tested 5 under battery brands to replace the original battery for my a6400 (video available on YT).
This battery being 3-4 times cheaper than a Sony, offers a very light better battery life (sony 1h25 in 4K approximately, K&F Concept 1h32) and in addition offers you almost non-existent discharge against the Sony that loses a lot of storage (sony in storage a few months, remains 30% battery, K&F Concept 99%, and it is confirmed in time of recording in 4k, amazing..).
Until then, she beats flat with stitching the Sony...
... BUT (it needed one)...
... she has a small flaw that does not (as much) the Sony. The calculation of the% remaining on the K&F Concept is far from predicted, when the battery indicates 0% it actually remains more than 25min of recording, so you have to get used to keep recording but at 0% and evaluate about 20 min before changing the battery.
Apart from in certain specific cases, it is very uncomfortable but a shame...
(This is the same for the Sony at 0% there are still several minutes of recording.. 10 minutes of head but there is less to spoil if we change to 0%)

In the end excellent battery I use without problems for several months, I strongly advise this battery even faced with the shamefully expensive Sony and that does not hold the charge on time!

Even if I choose, I prefer to get used to calculating that I have 20 good minutes left at 0% (the K&F Concept), than to take out my device after a few months to realize that I have only 10% left (the Sony). (especially 4 times cheaper)

If this comment helped you, do not forget to click on “useful”, thank you.

Small, lightweight, fast and takes a standard Micro USB connector? What's not to like.

The batteries themselves seem very good. They’re a slightly higher capacity that the original Sony ones at 1100mah. Having tested them, they last roughly the same length of time as the original Sony ones which is great.

The charger is small, light, takes two batteries (which charge simultaneously) and takes a standard Micro USB charger (which I’m sure you already have a small collection of). There are two LED lights that indicate when charging and when complete etc. The batteries are easy to load and are actually quite secure when in position.

Overall for the money it’s great and I’m happy to recommend it to any Sony shooter.

Small compact does its job.