I have owned and reviewed several K&F Concept camera accessories, and have always been impressed with the quality in terms of design and manufacturing, especially when you consider how reasonably priced their items are. This 3 pack Osmo Action camera batteries and a charger is no exception.

As usual, the items come in a K&F branded box. Inside is the charger, the 3 batteries and the USB-C charging lead. Note, you will need a power supply. I used a multi-USB Fast Charger that I had purchased separately. The batteries did arrive drained, so I did need to charge them before use. Charging times are not especially fast, nor are they slow. Around 4 hours for all of them to be charged. I suspect it would be quicker if I were charging one at a time. My only minor criticism is that I wish there were a better indicator other than red or green. At least an amber, or better still, a percentage meter. However, considering the price, this is a minor quibble. With regards to use with my Osmo Action 5 Pro, the batteries worked really well. I have used two of the 3 so far. I was just shy of the advertised 120 minutes of recording time. I achieved 110 minutes the first time, and 118 on the second time. But those times are similar to the times I get with the original Osmo battery. I had no issues with the batteries feeling hot whilst they charged (they barely got warm, let alone hot), and having had other batteries from K&F, I trust them to be safe. All in all, they are hard to fault, and therefore worthy of the full 5 stars.

2/3 batteries received worked as expected. Powered my Osmo Action 5 comparable to stock battery. One battery received in faulty. Bloated, squishy, and defective. Hoping to hear back quickly from K&F as all of the other products I’ve received from them have all worked flawlessly for all my camera needs.
*update 6/9/25
Very quick to hear back from K and F and they sent me a replacement battery very timely! Thank you!

The batteries last just as long as the original battery. No extended battery life, just as the same duration. I didn't expect much for the price of them since it's 3 compared to an Original that comes only with 1 battery.
Quality seems great, let's just see how long will they last. I gave 4 stars because with the charger it only charges up to 80% -ish percent and I would have to add it to the Action 5 Camera to finish the charging.

This set is pretty good The batteries seem to work just as well as the original. The charger is a bit on the slow side. It only consumes 12W of power (5V at 2.4A), and has both USB-C and micro-USB ports.

The set is very nicely packaged and can make a good gift for a DJI Action camera users.

Pretty good charger pack and with the batteries makes it ideal when you need it out and about

This battery charger kit 3-pack for Osmo Action cameras 3, 4, 5 Pro, or even Osmo 360 from brand K&F CONCEPT is a worthy replacement or at the very least a significant supplement for the existing OEM batteries that came with your DJI device, and is particularly good if you chose to buy the standalone action camera with only one battery, rather than as a kit combo with extra batteries or accessories like a block charger.

The value here is excellent, offering three like-for-like 2100mAh batteries in total. In terms of power and fast-charging ability, the charging box can recharge your original battery just as easily as the ones included in this package.

Overall it is will be a bonus in power longevity when out doing projects where you can't necessarily return home right away, extending your possibilities for creativity. 5 stars.

I have been getting some inconsistent charge percentages with these batteries. A couple times I have charged them and they said they were full but when I put them into the Action 5 they only read 60%. After a couple charges a discharges they seem to be going to 100%, but I’ve only cycled them a couple times so don’t fully have enough data to know how often they only partially charge.

They claim to be 2100mAh, but don’t quite run as long as the OEM 1950mAh batteries— though they are close, with these lasting 151min and the OEM lasting 159 min (both recording 23.98fps @ 4K). At the 6% “full charge” it only lasted 87min.

Regardless, it is really handy to have multiple batteries ready to go and swap at any time. When you’re using for professional use you can’t be sitting around waiting for batteries to charge. They just need to be reliable. Right now I don’t have full confidence in them (but even with 3 batteries @ 60% that’s still 4 additional hours of record time), but I’ll keep testing and update my review if need be.

These replacement batteries are definitely a godsend considering how expensive the original batteries are. The case comes complete with three batteries and a charger, but the batteries actually fit into the DJI charger that comes with the action five pro camera. Considering how quickly you can go through batteries in a whole day. It definitely makes sense to have a few extra kicking around.

This helped me a lot

The batteries are good. And I like how compact the charger is. This is a great option if you travel a lot and have a LOT of the Osmo batteries like I do. Very basic in feature set, but that simplicity is sometimes a nice thing to have.