Ok, so I wasn't sure about this, but I have found myself using this battery more than the battery my camera came with. The inclusion of the USB-C port is genius, and provides an easy way to recharge. Plus the fact that this is actually 130mAh bigger than the Nikon Z50 OEM battery is an added bonus.
It charges quickly, though I haven't tried it on various chargers to see what the time is, via USB-C. Having a backup battery is great for the times I want to record some video - and if you've done video on the Z50 you know it drains the battery pretty quickly, so you're going to end up needing a backup ANYWAY.

K&F Concept is a brand that makes a wide range of photo accessories. Most of their offerings are pretty basic--things like cleaning clothes, lens caps and replacement batteries. This EN-EL25 is the battery I use in my Nikon Z-30. As anyone who enjoys cameras knows you just can't have too many batteries. High quality battery at a reasonable price. Highly recommended!

This is a review of "K&F Concept 2600mAh EN-EL15C Battery Compatible with Nikon Z8 Zf Z7II Z7 Z 6II Z6 Z5 D850 D810 D810A D780 D750 D7500 D7200, USB C Fast Charging Battery"

I've tried a few K&F camera accessories and all have been well-designed, great quality and well-priced.

This battery ticks all those boxes too. And I love this type of battery - I have the Smallrig version too, this one is equally good. It should only be a matter of time before Nikon realise that they need to adapt the OEM batteries to allow for direct USB charging like this - means one less thing to pack when going on a trip.

Recognised immediately by my Z7 and Z8. Seems to last as long as the OEM versions too.

And I like the distinctive colour scheme!

Recommended.

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Note: As a member of the Vine program I was supplied with this item free of charge. I will always provide an impartial and fair review of the product in question. My rating system is as follows:

5 Stars – an exceptionally good, high quality product with no perceived shortcomings
4 stars – a very good product that met my expectations
3 stars – a product which could be better in some respects, but is still fit for purpose
2 stars - a product with significant shortcomings, one which disappointed
1 star - an absolute disaster of a product that should not be on sale

Like any K&F product I have ever5 ordered this doesn't disappoint, it is recognised by my charger - you would be surprised how often 3rd party batteries are rejected - charges at a decent rate and performs as far as I can tell inline with the OEM batteries.

Recommended.

This type of battery is probably one of my favorite newer camera accessory tech that came out in the last few years. Now that a lot of cameras don't come with a separate battery charger, since they can change in-camera, these are a perfect way to charge a spare at the same time be it at home through a dedicated charger or computer, or on the go with a laptop or power bank. They of course still charge in a dedicated battery charger.

Now back to this specific K&F version. It charges at around 10W so its among the faster charging batteries of this type. The cheaper alternatives charge at 5W speeds, so takes significantly longer to top off. It is also the nicest looking battery in my opinion; the brown and the blue ones are more eye catching for better or for worse but these look great. Honestly I don't really care about the color too much but manufacturers like to flex it as a selling point so... And finally, although it doesn't quite last as long as the original batteries these do manage to last a more than adequate amount of time. Knowing it is from K&F you also do get the peace of mind of a quality battery, unlike some of the weird, random branded traditionally charging third party batteries that are super inexpensive.

Now for my one complaint with this battery, it would be the location of the charging port. Most of the other USB-C charging batteries for other camera brands have the charging port at one of the extremities, usually on the opposite end of the actual pins of the battery. This one is on the effectively bottom side of the battery. It still works but I feel it is slightly less convenient sometimes... this is purely a matter of preference though, and considering SmallRig's version also charges at the same location this might be a limitation to the internal structure of the EN-EL15C.

Overall, this is an excellent choice for USB-C rechargeable batteries for your Nikon.

This EN-EL25 compatible battery works with my Nikon as of Z30 August 2024

The original Nikon batteries can be charged in camera in the Nikon Z30 (which doesn't come with an external charger) These K&F Concept batteries also charge in camera.

The K&F battery also has a USB-C port for external charging , which is a significant improvement over the Nikon OEM and useful for travel etc.
The K&F includes a USB-C to USB-A cable but no plug in charger.

The price is less than a Nikon original , however, several 3rd party are availabe with USB-C charging for similar amounts, or in sets of 2 for less per battery, so value is reasonable, not class leading

This rechargeable 2600mAh 7.2V Lithium camera battery is compatible with Nikon Z8, Z7II, Z 7, Z 6II, Z 6, Z5, D850, D810, D810A, D780, D750, D610, D500, D7500, D7200. It comes with a USB Type-C charging cable, and takes approximately 2.5 hours to fully charge. It can be charged with a powerbank, wall adapter, car charger, laptop, etc…During charging the light will be red, and turn green when charging is complete. This battery also has over. heating/voltage/discharge/current/short circuit/charging protection. This is an excellent replacement battery that is fully decoded.

It's been common advice to only go with OEM when it comes to batteries for cameras. I think that used to be true, but isn't anymore. Battery technology has come so incredibly far, and third-party manufacturers are the ones leading the charge. Nowadays, third party is better, cheaper, and include all the best features too.

In terms of build-quality, this thing is top notch. The plastic feels solid, with no flex whatsoever. It slides into my Nikon Z7 with zero issues, and powers my camera just fine. The 2600 mAh capacity is 14% higher than OEM's 2280mAh capacity. It's also $26 cheaper than OEM too, at the time of writing. Most importantly however, it has that all powerful USB-C port built in, so you don't have to use an annoying wall outlet or dock to charge it. It's just so much more convenient charging it this way, and I would honestly pay more for this feature... but they charge less. The only thing I can't attest to yet is its longevity, but I'll be sure to update my review if anything changes with that. As it stands, this is a must-have for photographers that need extra juice for their cameras. 6/5 stars

There are slight differences between Nikon battery with K&F battery. Operational wise the battery works on Nikon Z6III body, I can charge the battery using the Z6 III body or directly usb C charge on the battery. Capacity wise I don’t see difference of number of shots between Nikon and this battery.