These batteries are excellent. I love that DJI has maintained the same battery style across the past versions, and these work perfectly with my Action 4. The capacity of these batteries is actually slightly higher than the stock battery, and I’ve had no issues with their runtime. In most cases, I swap batteries not because the old one is drained, but because I need a fresh battery to start a new recording segment without interruption.

They charge quickly and hold a good charge for a long time. They fit perfectly in the camera and remove just as easily. I haven’t noticed any swelling, which can be a problem with some aftermarket batteries.

The only minor quirk is with the charger. When plugged in, a battery that isn’t fully charged shows a red light, and it doesn’t automatically turn green when fully charged. I’ve found that unplugging and re-plugging the battery resolves this, at which point the light turns green, confirming a full charge. It’s easy to work around once you know.

Overall, this set is a great value. The included 3-battery charger is convenient for managing multiple batteries. While it isn’t fast-charging, the small batteries usually reach full charge in about an hour or two. For the price, it’s an excellent way to keep spare power on hand for your DJI Action 4. Highly recommended.

I ran into some problems with this K&F battery pack unit. The batteries all charged quickly but when installed in the camera, would not register the correct charge. I honestly am not sure why this was the case or what needed to be done differently but they ultimately corrected themselves on their own. I'm not sure if a firmware update resolved it.

Battery life is about par with the included OEM batteries but i have not compared it yet. The only thing I would have liked to have seen differently is the dock. It feels quite cheap and flimsy and a travel case would have been a more ideal format than a dock.

The ideal battery set to use with your action camera. They work exactly like the original, and performance-wise, I have been getting around the same recording time as the OEM battery. Overall, the batteries are great. Also, in this kit, you get a 3-battery charger, which is great if you have multiple batteries. Unfortunately, it is not fast-charging, but that's fine; these batteries are small, so it usually takes about an hour or two to fully charge them. Overall, for the price of a charger and three batteries, this is an excellent deal if you own any of the DJI action cameras. I highly recommend it.

These batteries are great. I love the fact that DJI has not changed their battery style for the past 3 versions of their Action cameras and these work perfectly in my Action5. The Ah of these batteries is actually slightly higher than the stock battery that came with the camera and I’ve had no issues with the time that they last and in most cases, I have changed the battery, not because the old one was expired, but because I needed to start filming a new segment and didn’t want a battery to die in the middle of it. They charge quickly and last a good long time. They fit perfectly in the camera and remove just as easily. I haven’t noticed any swelling of the batteries at all, which can happen with some after market batteries. The one issue I’ve had is with the charger. When plugged in, a battery that is not fully charged will provide a red light, indicating that it is charging and it is supposed to turn green when fully charged. I have found that this charger never turns green automatically and it is only after I wonder what is taking so long, and I unplug the battery and plug it back in to the charger, that the light suddenly turns green, indicating that the battery is fully charged. Putting the battery into the camera at that point also confirms that it is at 100%. As long as you know that is how the charger reacts, it is very easy to work around that. Just a great set at a great price and like the title says, a very economical way to get spare batteries for you Action cameras.

As per usual, K&F coming in clutch. This K&F Concept battery pack that I use for my Osmo Action 3 is an excellent choice for anyone needing extra power. The batteries perform just as well as the original OEM batteries, with no noticeable difference in runtime or performance. They fit securely in the camera and maintain the waterproof seal, giving you peace of mind during any adventure. The camera recognizes them perfectly, so you won't get any annoying error messages. Overall, this is a reliable and affordable alternative that works seamlessly with your Osmo Action 3.

I haven't used them in the snow yet as it's not winter so I'm not sure how they function in the cold but for warm humid climate it's nearly identical to OEM.

They work and fit perfectly. I haven't stress-tested them but so far I'm inclined to believe all three batteries work as described. The 3-pack charging dock is pretty nice too.

These are close to on par to the OEM, which are hard to find right now.

Been using these batteries with my DJI Action 4 and 5, and so far they’ve worked just as well as the original DJI ones. I shoot video pretty often for YouTube, and having extra batteries ready to go is a must—these haven’t let me down.

The kit comes with three batteries and a charging hub. The charger isn’t super compact, so it's more for setting up on a desk than tossing in a small gear bag, but it gets the job done. Red and green lights let you know when they’re charging or done—simple, but it works.

I ran a couple of casual runtime tests in 4K30 just to see how they compare, and the results were right in line with what I get from the DJI-branded battery. One of them actually ran just a bit longer than the original. Not a lab test or anything, but enough for me to feel confident using these for longer shoots.

Cables are long enough to be usable and everything feels decently made—not cheap or flimsy. If you’re looking for a backup set for your Osmo Action cameras, this kit gives you good value and peace of mind without spending a ton.

I have put these batteries to the test in my action 4 and 5 cameras from DJI and they are just as good as the factory batteries in my experience. I use my cameras year round and these batteries and charger have been exceptional performers. Money well spent right here folks!

useful but batteries die quickly , but that my be the nature of such a compact , watertight product with a camera & 2 bright on screen displays