For starters, I need to comment on people saying that their batteries are 1840 mah because the cynova charger shows that. The way these batteries work is the battery management system that is built into the battery itself does not report the proper capacity until full charge and discharge cycles that being said I have one battery that works properly and comes up as 2350mah over 9watt hrs which is the proper way to measure! The battery records over two hours at 5.7 K and is still at 16% battery. That’s pretty good. This is for an Insta 360 X4.

Battery working and charging well, but capacity is not even remotely close to what is advertised.

1840maH, or 80% of the original insta360 battery, and 78% of the advertised.

Still, great value for the price. if they hold up and retain battery health.

Giving 2 stars because one of the batteries works perfectly, but the other has a design flaw which renders it almost useless. The eject mechanism on the left side is slightly raised compared to the right, preventing it from locking in place properly. While the right battery fits seamlessly with no gaps, the left one has a noticeable gap on the upper left side, which stops it from clamping securely. I attached a photo showing one battery fitting with an airtight seal and another showing the defective battery, where the rubber distortion prevents a proper seal. As a result, the camera is no longer weatherproof.

Update 3: upgrading to 4 stars because upon reaching out to their customer support email, they corrected the issues at hand and sent me a replacement battery and entire new kit as courtesy after providing proof of the defects. The current kit they sent me was experiencing.

Great extra batteries that don't trigger the unsupported battery notification. So far they seem to last the same amount of time as the standard battery.

Side note: this product would be even better if you could just buy individual batteries. As it stabds you need to get thw whole kit, if you need another replacement.

The K&F Concept Insta 360 X4 Camera Battery Bundle with Charger is a MUST HAVE for those looking for some affordable battery replacements for their Insta360 X4. At the cost of less than one OEM Insta360 battery, you are provided with not one, but TWO higher capacity batteries along with a nice compact charger and USB-A to USB-C cable for charging. Build quality is nice and seemingly more rugged and a bit improved over the originals, with metal battery release prongs instead of the plastic ones that the original OEM batteries are made with. The rubberized water-tight seal is evident on both replacement batteries and they both fit nice and snug in the battery compartment of the X4. Capacity shows 2350mAh for the K&F batteries vs the 2290mAh on the originals. Basically 60mAh higher, although not sure how much longer it will power the camera vs the original. When snapped into the camera, the batteries both came showing that they were pre-charged at the factory, with just over 60% power remaining. Will have to see whether the battery capacity continues to retain nominal charge once I have more extensive use with these batteries. In the meantime, having the charger available to keep spare batteries charged is great instead of having to charge the batteries in the camera; allowing for extended use of the camera when needed. Surprisingly, the weight of the K&F batteries were seemingly a touch lighter than the OEM battery so I’ll have to keep an eye on whether the battery capacity is truly as stated. For now, I’m happy with the bundle as it allows me to go on trips without having to worry about running out of battery power at inopportune times. Again, for the cost of less than one OEM battery, you get two spare batteries AND a charger so this is a no brainer. Two thumbs way up for the K&F Concept battery bundle. Definitely a good purchase for your X4 camera!

The K&F Concept batteries are excellent for my Insta360 X4.
With a capacity of 2350mAh, they provide a long runtime before needing to be recharged.
The included charger is fast and compact, which is very convenient for traveling.
A reliable product for those looking to extend the life of their action camera.
I highly recommend to all Insta360 X4 users.

lithium battery with charger for Insta 360 of good quality, it recharges quickly and discharges slowly, I recommend

In addition to the original, having 2 extra spare batteries that are recharged while you use the 3 batteries in your case is a fantastic thing.

You will never have empty batteries during the day, because the case equipped with a USB-C socket can be connected to an external battery to charge the 2 batteries simultaneously, using the third to make videos.

Ideal for trips outside the city, but also for long sessions, if the camera allows it not to get too hot, we will have hours of recording without problems, some using them in loop, you will cover many hours.

excellent product at a low price!

The K&F Concept Battery and Charger Set for the Insta360 X4 offers a convenient solution for extended filming sessions. With two 2500mAh rechargeable batteries and a dual-port charger, it’s much easier to keep your camera powered up throughout a day of filming. The charger’s compact design is great for travel, and the batteries seem to hold their charge well, allowing you to shoot multiple shots before needing to swap them out. The build quality seems solid, and the charging process is relatively quick.

K&F continues to come through with great products at a reasonable price!

Work just like the OEM batteries at a fraction of the price. You get two batteries and charger for less than one OEM battery! As far as I can tell they last just as long, but I haven't done any real tests. They fit well and the materials seem quality.

The charger is great and I love that it's USB-C! I charge at home, but it's nice to know I can charge it in my truck or from a battery pack in a pinch.

Overall I would recommend just like all the other K&F products I've purchased.